THE RR LYRAE VARIABLES AND HORIZONTAL BRANCH OF NGC 6656 (M22)

The first calibrated broadband UBVI time-series photometry is presented for the RR Lyrae variable stars in NGC 6656 (M22), with observations spanning a range of 22 years. We have also redetermined the variability types and periods for the RR Lyrae stars identified previously by photographic observat...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:The Astronomical journal 2013-11, Vol.146 (5), p.1-15
Hauptverfasser: KUNDER, ANDREA, Stetson, Peter B, Cassisi, Santi, Layden, Andrew, Bono, Giuseppe, Catelan, Marcio, Walker, Alistair R, Alvarez, Leonardo Paredes, Clem, James L, Matsunaga, Noriyuki, Salaris, Maurizio, Lee, Jae-Woo, Chaboyer, Brian
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
container_end_page 15
container_issue 5
container_start_page 1
container_title The Astronomical journal
container_volume 146
creator KUNDER, ANDREA
Stetson, Peter B
Cassisi, Santi
Layden, Andrew
Bono, Giuseppe
Catelan, Marcio
Walker, Alistair R
Alvarez, Leonardo Paredes
Clem, James L
Matsunaga, Noriyuki
Salaris, Maurizio
Lee, Jae-Woo
Chaboyer, Brian
description The first calibrated broadband UBVI time-series photometry is presented for the RR Lyrae variable stars in NGC 6656 (M22), with observations spanning a range of 22 years. We have also redetermined the variability types and periods for the RR Lyrae stars identified previously by photographic observations, revising the number of fundamental-mode RR Lyrae variables (RR0) to 10 and the number of first-overtone variables (RR1) to 16. The mean periods of the RR0 and RR1 variables are [left angle bracket]P[right angle bracket] sub(RRO) = 0.66 + or - 0.02 days and [left angle bracket]P[right angle bracket] sub(RR1) = 0.33 + or - 0.01 days, respectively, supporting an Oosterhoff II classification for the cluster. The number ratio of RR1-type to all RR-type variables is N sub(1)/N sub(RR) = 0.61, also consistent with an Oosterhoff II designation. Both the RR Lyrae stars' minimum light colors and the blue edge of the RR Lyrae instability strip suggest E(B - V) = 0.36 + or - 0.02 mag toward M22. Regarding the HB morphology of M22, we find (B-R)/(B+V+R) = +0.97 + or - 0.1 and at least one "gap" located in an unusual part of the blue HB, in the middle of the so-called hot HB stars.
doi_str_mv 10.1088/0004-6256/146/5/119
format Article
fullrecord <record><control><sourceid>proquest_osti_</sourceid><recordid>TN_cdi_osti_scitechconnect_22273321</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>1660440794</sourcerecordid><originalsourceid>FETCH-LOGICAL-o249t-ffc010343ebb5dbb0519374a9addde83292a2f066d12eb95e62f974bfbf15b433</originalsourceid><addsrcrecordid>eNqNzE1LwzAcgPEgCs7pJ_AS8DIPtfnnrclFyGq3DmoLdQp6KU2b4GSuarrvrzDx7Om5_HgQugRyA0SpmBDCI0mFjIHLWMQA-ghNQDAVMaXgGE3-xCk6C-GNEABF-ATdrvMM1zUunmuT4SdTr8y8yB6wKe9wXtWrl6pcmwLPa1OmOa4WuFymWEoh8eye0utzdOLbbXAXv52ix0W2TvOoqJar1BTRQLkeI-87AoRx5qwVvbVEgGYJb3Xb971TjGraUk-k7IE6q4WT1OuEW289CMsZm6Krw3cI46YJ3WZ03Ws37HauGxtKacIYhR81O6iPr-Fz78LYvG9C57bbdueGfWhASq20Bq7_QwnnJNGcfQNLzl9t</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>1660440794</pqid></control><display><type>article</type><title>THE RR LYRAE VARIABLES AND HORIZONTAL BRANCH OF NGC 6656 (M22)</title><source>IOP Publishing Free Content</source><source>Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals</source><source>IOPscience extra</source><source>Alma/SFX Local Collection</source><creator>KUNDER, ANDREA ; Stetson, Peter B ; Cassisi, Santi ; Layden, Andrew ; Bono, Giuseppe ; Catelan, Marcio ; Walker, Alistair R ; Alvarez, Leonardo Paredes ; Clem, James L ; Matsunaga, Noriyuki ; Salaris, Maurizio ; Lee, Jae-Woo ; Chaboyer, Brian</creator><creatorcontrib>KUNDER, ANDREA ; Stetson, Peter B ; Cassisi, Santi ; Layden, Andrew ; Bono, Giuseppe ; Catelan, Marcio ; Walker, Alistair R ; Alvarez, Leonardo Paredes ; Clem, James L ; Matsunaga, Noriyuki ; Salaris, Maurizio ; Lee, Jae-Woo ; Chaboyer, Brian</creatorcontrib><description>The first calibrated broadband UBVI time-series photometry is presented for the RR Lyrae variable stars in NGC 6656 (M22), with observations spanning a range of 22 years. We have also redetermined the variability types and periods for the RR Lyrae stars identified previously by photographic observations, revising the number of fundamental-mode RR Lyrae variables (RR0) to 10 and the number of first-overtone variables (RR1) to 16. The mean periods of the RR0 and RR1 variables are [left angle bracket]P[right angle bracket] sub(RRO) = 0.66 + or - 0.02 days and [left angle bracket]P[right angle bracket] sub(RR1) = 0.33 + or - 0.01 days, respectively, supporting an Oosterhoff II classification for the cluster. The number ratio of RR1-type to all RR-type variables is N sub(1)/N sub(RR) = 0.61, also consistent with an Oosterhoff II designation. Both the RR Lyrae stars' minimum light colors and the blue edge of the RR Lyrae instability strip suggest E(B - V) = 0.36 + or - 0.02 mag toward M22. Regarding the HB morphology of M22, we find (B-R)/(B+V+R) = +0.97 + or - 0.1 and at least one "gap" located in an unusual part of the blue HB, in the middle of the so-called hot HB stars.</description><identifier>ISSN: 0004-6256</identifier><identifier>ISSN: 1538-3881</identifier><identifier>EISSN: 1538-3881</identifier><identifier>DOI: 10.1088/0004-6256/146/5/119</identifier><language>eng</language><publisher>United States</publisher><subject>Astronomical instruments ; ASTRONOMY ; ASTROPHYSICS ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; Broadband ; Calibration ; Classification ; Clusters ; COLOR ; DISTANCE ; GALAXIES ; Instability ; MORPHOLOGY ; PHOTOGRAPHY ; PHOTOMETRY ; STAR EVOLUTION ; Stars ; VARIABLE STARS ; VISIBLE RADIATION</subject><ispartof>The Astronomical journal, 2013-11, Vol.146 (5), p.1-15</ispartof><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,27903,27904</link.rule.ids><backlink>$$Uhttps://www.osti.gov/biblio/22273321$$D View this record in Osti.gov$$Hfree_for_read</backlink></links><search><creatorcontrib>KUNDER, ANDREA</creatorcontrib><creatorcontrib>Stetson, Peter B</creatorcontrib><creatorcontrib>Cassisi, Santi</creatorcontrib><creatorcontrib>Layden, Andrew</creatorcontrib><creatorcontrib>Bono, Giuseppe</creatorcontrib><creatorcontrib>Catelan, Marcio</creatorcontrib><creatorcontrib>Walker, Alistair R</creatorcontrib><creatorcontrib>Alvarez, Leonardo Paredes</creatorcontrib><creatorcontrib>Clem, James L</creatorcontrib><creatorcontrib>Matsunaga, Noriyuki</creatorcontrib><creatorcontrib>Salaris, Maurizio</creatorcontrib><creatorcontrib>Lee, Jae-Woo</creatorcontrib><creatorcontrib>Chaboyer, Brian</creatorcontrib><title>THE RR LYRAE VARIABLES AND HORIZONTAL BRANCH OF NGC 6656 (M22)</title><title>The Astronomical journal</title><description>The first calibrated broadband UBVI time-series photometry is presented for the RR Lyrae variable stars in NGC 6656 (M22), with observations spanning a range of 22 years. We have also redetermined the variability types and periods for the RR Lyrae stars identified previously by photographic observations, revising the number of fundamental-mode RR Lyrae variables (RR0) to 10 and the number of first-overtone variables (RR1) to 16. The mean periods of the RR0 and RR1 variables are [left angle bracket]P[right angle bracket] sub(RRO) = 0.66 + or - 0.02 days and [left angle bracket]P[right angle bracket] sub(RR1) = 0.33 + or - 0.01 days, respectively, supporting an Oosterhoff II classification for the cluster. The number ratio of RR1-type to all RR-type variables is N sub(1)/N sub(RR) = 0.61, also consistent with an Oosterhoff II designation. Both the RR Lyrae stars' minimum light colors and the blue edge of the RR Lyrae instability strip suggest E(B - V) = 0.36 + or - 0.02 mag toward M22. Regarding the HB morphology of M22, we find (B-R)/(B+V+R) = +0.97 + or - 0.1 and at least one "gap" located in an unusual part of the blue HB, in the middle of the so-called hot HB stars.</description><subject>Astronomical instruments</subject><subject>ASTRONOMY</subject><subject>ASTROPHYSICS</subject><subject>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</subject><subject>Broadband</subject><subject>Calibration</subject><subject>Classification</subject><subject>Clusters</subject><subject>COLOR</subject><subject>DISTANCE</subject><subject>GALAXIES</subject><subject>Instability</subject><subject>MORPHOLOGY</subject><subject>PHOTOGRAPHY</subject><subject>PHOTOMETRY</subject><subject>STAR EVOLUTION</subject><subject>Stars</subject><subject>VARIABLE STARS</subject><subject>VISIBLE RADIATION</subject><issn>0004-6256</issn><issn>1538-3881</issn><issn>1538-3881</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2013</creationdate><recordtype>article</recordtype><recordid>eNqNzE1LwzAcgPEgCs7pJ_AS8DIPtfnnrclFyGq3DmoLdQp6KU2b4GSuarrvrzDx7Om5_HgQugRyA0SpmBDCI0mFjIHLWMQA-ghNQDAVMaXgGE3-xCk6C-GNEABF-ATdrvMM1zUunmuT4SdTr8y8yB6wKe9wXtWrl6pcmwLPa1OmOa4WuFymWEoh8eye0utzdOLbbXAXv52ix0W2TvOoqJar1BTRQLkeI-87AoRx5qwVvbVEgGYJb3Xb971TjGraUk-k7IE6q4WT1OuEW289CMsZm6Krw3cI46YJ3WZ03Ws37HauGxtKacIYhR81O6iPr-Fz78LYvG9C57bbdueGfWhASq20Bq7_QwnnJNGcfQNLzl9t</recordid><startdate>20131101</startdate><enddate>20131101</enddate><creator>KUNDER, ANDREA</creator><creator>Stetson, Peter B</creator><creator>Cassisi, Santi</creator><creator>Layden, Andrew</creator><creator>Bono, Giuseppe</creator><creator>Catelan, Marcio</creator><creator>Walker, Alistair R</creator><creator>Alvarez, Leonardo Paredes</creator><creator>Clem, James L</creator><creator>Matsunaga, Noriyuki</creator><creator>Salaris, Maurizio</creator><creator>Lee, Jae-Woo</creator><creator>Chaboyer, Brian</creator><scope>7TG</scope><scope>KL.</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>OTOTI</scope></search><sort><creationdate>20131101</creationdate><title>THE RR LYRAE VARIABLES AND HORIZONTAL BRANCH OF NGC 6656 (M22)</title><author>KUNDER, ANDREA ; Stetson, Peter B ; Cassisi, Santi ; Layden, Andrew ; Bono, Giuseppe ; Catelan, Marcio ; Walker, Alistair R ; Alvarez, Leonardo Paredes ; Clem, James L ; Matsunaga, Noriyuki ; Salaris, Maurizio ; Lee, Jae-Woo ; Chaboyer, Brian</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-o249t-ffc010343ebb5dbb0519374a9addde83292a2f066d12eb95e62f974bfbf15b433</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2013</creationdate><topic>Astronomical instruments</topic><topic>ASTRONOMY</topic><topic>ASTROPHYSICS</topic><topic>ASTROPHYSICS, COSMOLOGY AND ASTRONOMY</topic><topic>Broadband</topic><topic>Calibration</topic><topic>Classification</topic><topic>Clusters</topic><topic>COLOR</topic><topic>DISTANCE</topic><topic>GALAXIES</topic><topic>Instability</topic><topic>MORPHOLOGY</topic><topic>PHOTOGRAPHY</topic><topic>PHOTOMETRY</topic><topic>STAR EVOLUTION</topic><topic>Stars</topic><topic>VARIABLE STARS</topic><topic>VISIBLE RADIATION</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>KUNDER, ANDREA</creatorcontrib><creatorcontrib>Stetson, Peter B</creatorcontrib><creatorcontrib>Cassisi, Santi</creatorcontrib><creatorcontrib>Layden, Andrew</creatorcontrib><creatorcontrib>Bono, Giuseppe</creatorcontrib><creatorcontrib>Catelan, Marcio</creatorcontrib><creatorcontrib>Walker, Alistair R</creatorcontrib><creatorcontrib>Alvarez, Leonardo Paredes</creatorcontrib><creatorcontrib>Clem, James L</creatorcontrib><creatorcontrib>Matsunaga, Noriyuki</creatorcontrib><creatorcontrib>Salaris, Maurizio</creatorcontrib><creatorcontrib>Lee, Jae-Woo</creatorcontrib><creatorcontrib>Chaboyer, Brian</creatorcontrib><collection>Meteorological &amp; Geoastrophysical Abstracts</collection><collection>Meteorological &amp; Geoastrophysical Abstracts - Academic</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>OSTI.GOV</collection><jtitle>The Astronomical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>KUNDER, ANDREA</au><au>Stetson, Peter B</au><au>Cassisi, Santi</au><au>Layden, Andrew</au><au>Bono, Giuseppe</au><au>Catelan, Marcio</au><au>Walker, Alistair R</au><au>Alvarez, Leonardo Paredes</au><au>Clem, James L</au><au>Matsunaga, Noriyuki</au><au>Salaris, Maurizio</au><au>Lee, Jae-Woo</au><au>Chaboyer, Brian</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>THE RR LYRAE VARIABLES AND HORIZONTAL BRANCH OF NGC 6656 (M22)</atitle><jtitle>The Astronomical journal</jtitle><date>2013-11-01</date><risdate>2013</risdate><volume>146</volume><issue>5</issue><spage>1</spage><epage>15</epage><pages>1-15</pages><issn>0004-6256</issn><issn>1538-3881</issn><eissn>1538-3881</eissn><abstract>The first calibrated broadband UBVI time-series photometry is presented for the RR Lyrae variable stars in NGC 6656 (M22), with observations spanning a range of 22 years. We have also redetermined the variability types and periods for the RR Lyrae stars identified previously by photographic observations, revising the number of fundamental-mode RR Lyrae variables (RR0) to 10 and the number of first-overtone variables (RR1) to 16. The mean periods of the RR0 and RR1 variables are [left angle bracket]P[right angle bracket] sub(RRO) = 0.66 + or - 0.02 days and [left angle bracket]P[right angle bracket] sub(RR1) = 0.33 + or - 0.01 days, respectively, supporting an Oosterhoff II classification for the cluster. The number ratio of RR1-type to all RR-type variables is N sub(1)/N sub(RR) = 0.61, also consistent with an Oosterhoff II designation. Both the RR Lyrae stars' minimum light colors and the blue edge of the RR Lyrae instability strip suggest E(B - V) = 0.36 + or - 0.02 mag toward M22. Regarding the HB morphology of M22, we find (B-R)/(B+V+R) = +0.97 + or - 0.1 and at least one "gap" located in an unusual part of the blue HB, in the middle of the so-called hot HB stars.</abstract><cop>United States</cop><doi>10.1088/0004-6256/146/5/119</doi><tpages>15</tpages></addata></record>
fulltext fulltext
identifier ISSN: 0004-6256
ispartof The Astronomical journal, 2013-11, Vol.146 (5), p.1-15
issn 0004-6256
1538-3881
1538-3881
language eng
recordid cdi_osti_scitechconnect_22273321
source IOP Publishing Free Content; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; IOPscience extra; Alma/SFX Local Collection
subjects Astronomical instruments
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Broadband
Calibration
Classification
Clusters
COLOR
DISTANCE
GALAXIES
Instability
MORPHOLOGY
PHOTOGRAPHY
PHOTOMETRY
STAR EVOLUTION
Stars
VARIABLE STARS
VISIBLE RADIATION
title THE RR LYRAE VARIABLES AND HORIZONTAL BRANCH OF NGC 6656 (M22)
url https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-01-23T04%3A56%3A37IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-proquest_osti_&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.atitle=THE%20RR%20LYRAE%20VARIABLES%20AND%20HORIZONTAL%20BRANCH%20OF%20NGC%206656%20(M22)&rft.jtitle=The%20Astronomical%20journal&rft.au=KUNDER,%20ANDREA&rft.date=2013-11-01&rft.volume=146&rft.issue=5&rft.spage=1&rft.epage=15&rft.pages=1-15&rft.issn=0004-6256&rft.eissn=1538-3881&rft_id=info:doi/10.1088/0004-6256/146/5/119&rft_dat=%3Cproquest_osti_%3E1660440794%3C/proquest_osti_%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_pqid=1660440794&rft_id=info:pmid/&rfr_iscdi=true