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...
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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. |
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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 & Geoastrophysical Abstracts</collection><collection>Meteorological & 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> |
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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) |
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