THE ORBIT OF THE CLASSICAL CEPHEID U AQUILAE
A total of 62 new radial-velocity observations ofthe classical Cepheid U Aql have been obtained during the interval 1969-86. We present the first determination of a spectroscopic binary orbit for this star. The orbital elements derived from both new and published velocities are: P= 1856.4 ± 4.3 days...
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| Veröffentlicht in: | Publications of the Astronomical Society of the Pacific 1987-07, Vol.99 (617), p.610-616 |
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| container_title | Publications of the Astronomical Society of the Pacific |
| container_volume | 99 |
| creator | WELCH, DOUGLAS L. EVANS, NANCY R. LYONS, RON W. HARRIS, HUGH C. BARNES, THOMAS G. SLOVAK, MARK H. MOFFETT, THOMAS J. |
| description | A total of 62 new radial-velocity observations ofthe classical Cepheid U Aql have been obtained during the interval 1969-86. We present the first determination of a spectroscopic binary orbit for this star. The orbital elements derived from both new and published velocities are: P= 1856.4 ± 4.3 days K1 = 7.81 ± 0.22 km s−1 γ =1.15 ± 0.15 km s−1 e = 0.165 ± 0.027 ω = 190.5 ± 7.7 deg T = 2442754 ± 38 JD a1 sin i = 196.7 ± 5.5 Gm = 1.311 ± 0.037 AU f(m) = 0.0881 ± 0.0074 M⊙ IUE observations reported by Böhm-Vitense and Proffitt (1985) indicate the presence of an early-type main-sequence companion. The orbital elements combined with estimates ofthe companion mass result in upper limits for the mass of the Cepheid in the range 6.4-8.8 M⊙. The possibility of spatially resolving the system using interferometric techniques is discussed. |
| doi_str_mv | 10.1086/132022 |
| format | Article |
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We present the first determination of a spectroscopic binary orbit for this star. The orbital elements derived from both new and published velocities are: P= 1856.4 ± 4.3 days K1 = 7.81 ± 0.22 km s−1 γ =1.15 ± 0.15 km s−1 e = 0.165 ± 0.027 ω = 190.5 ± 7.7 deg T = 2442754 ± 38 JD a1 sin i = 196.7 ± 5.5 Gm = 1.311 ± 0.037 AU f(m) = 0.0881 ± 0.0074 M⊙ IUE observations reported by Böhm-Vitense and Proffitt (1985) indicate the presence of an early-type main-sequence companion. The orbital elements combined with estimates ofthe companion mass result in upper limits for the mass of the Cepheid in the range 6.4-8.8 M⊙. The possibility of spatially resolving the system using interferometric techniques is discussed.</description><identifier>ISSN: 0004-6280</identifier><identifier>EISSN: 1538-3873</identifier><identifier>DOI: 10.1086/132022</identifier><identifier>CODEN: PASPAU</identifier><language>eng</language><publisher>Chicago, IL: The Astronomical Society of the Pacific</publisher><subject>Astronomy ; Cepheids ; Cepheids (delta cephei, w virginis) ; Earth, ocean, space ; Ephemerides ; Exact sciences and technology ; Observatories ; Orbital elements ; Orbital evolution ; Orbital velocity ; Phase shift ; Radial velocity ; Stars ; Telescopes ; Variable and peculiar stars (including novae) ; Wavelengths</subject><ispartof>Publications of the Astronomical Society of the Pacific, 1987-07, Vol.99 (617), p.610-616</ispartof><rights>1988 INIST-CNRS</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c236t-c5a439b41d6a4ddd4048e6abe6793a07004b845b0b74204c2ffafdf39212150d3</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.jstor.org/stable/pdf/40678971$$EPDF$$P50$$Gjstor$$H</linktopdf><linktohtml>$$Uhttps://www.jstor.org/stable/40678971$$EHTML$$P50$$Gjstor$$H</linktohtml><link.rule.ids>314,777,781,800,27905,27906,57998,58231</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=7488138$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>WELCH, DOUGLAS L.</creatorcontrib><creatorcontrib>EVANS, NANCY R.</creatorcontrib><creatorcontrib>LYONS, RON W.</creatorcontrib><creatorcontrib>HARRIS, HUGH C.</creatorcontrib><creatorcontrib>BARNES, THOMAS G.</creatorcontrib><creatorcontrib>SLOVAK, MARK H.</creatorcontrib><creatorcontrib>MOFFETT, THOMAS J.</creatorcontrib><title>THE ORBIT OF THE CLASSICAL CEPHEID U AQUILAE</title><title>Publications of the Astronomical Society of the Pacific</title><description>A total of 62 new radial-velocity observations ofthe classical Cepheid U Aql have been obtained during the interval 1969-86. We present the first determination of a spectroscopic binary orbit for this star. The orbital elements derived from both new and published velocities are: P= 1856.4 ± 4.3 days K1 = 7.81 ± 0.22 km s−1 γ =1.15 ± 0.15 km s−1 e = 0.165 ± 0.027 ω = 190.5 ± 7.7 deg T = 2442754 ± 38 JD a1 sin i = 196.7 ± 5.5 Gm = 1.311 ± 0.037 AU f(m) = 0.0881 ± 0.0074 M⊙ IUE observations reported by Böhm-Vitense and Proffitt (1985) indicate the presence of an early-type main-sequence companion. The orbital elements combined with estimates ofthe companion mass result in upper limits for the mass of the Cepheid in the range 6.4-8.8 M⊙. The possibility of spatially resolving the system using interferometric techniques is discussed.</description><subject>Astronomy</subject><subject>Cepheids</subject><subject>Cepheids (delta cephei, w virginis)</subject><subject>Earth, ocean, space</subject><subject>Ephemerides</subject><subject>Exact sciences and technology</subject><subject>Observatories</subject><subject>Orbital elements</subject><subject>Orbital evolution</subject><subject>Orbital velocity</subject><subject>Phase shift</subject><subject>Radial velocity</subject><subject>Stars</subject><subject>Telescopes</subject><subject>Variable and peculiar stars (including novae)</subject><subject>Wavelengths</subject><issn>0004-6280</issn><issn>1538-3873</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1987</creationdate><recordtype>article</recordtype><recordid>eNo9z1FLwzAQB_AgCtap30Dog_hk9S5Jk_Sx1s4WClXXPpc0aWBjutHsxW-_jsqejuN-d9yfkHuEFwQlXpFRoPSCBBgzFTEl2SUJAIBHgiq4JjfebwAQFUJAnpsiD-vvt7IJ62V4arIqXa3KLK3CLP8s8vI9bMP0qy2rNL8lV05v_XD3XxekXeZNVkRV_XHaiAxl4hCZWHOW9Byt0Nxay4GrQeh-EDJhGuT0Sq943EMvOQVuqHPaWccSihRjsGxBnua7Ztx5Pw6u24_rHz3-dQjdKWM3Z5zg4wz32hu9daP-NWt_1pIrhUxN7GFmG3_YjecxByFVIpEdAYb1Ut0</recordid><startdate>19870701</startdate><enddate>19870701</enddate><creator>WELCH, DOUGLAS L.</creator><creator>EVANS, NANCY R.</creator><creator>LYONS, RON W.</creator><creator>HARRIS, HUGH C.</creator><creator>BARNES, THOMAS G.</creator><creator>SLOVAK, MARK H.</creator><creator>MOFFETT, THOMAS J.</creator><general>The Astronomical Society of the Pacific</general><general>University of Chicago Press</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>19870701</creationdate><title>THE ORBIT OF THE CLASSICAL CEPHEID U AQUILAE</title><author>WELCH, DOUGLAS L. ; EVANS, NANCY R. ; LYONS, RON W. ; HARRIS, HUGH C. ; BARNES, THOMAS G. ; SLOVAK, MARK H. ; MOFFETT, THOMAS J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c236t-c5a439b41d6a4ddd4048e6abe6793a07004b845b0b74204c2ffafdf39212150d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1987</creationdate><topic>Astronomy</topic><topic>Cepheids</topic><topic>Cepheids (delta cephei, w virginis)</topic><topic>Earth, ocean, space</topic><topic>Ephemerides</topic><topic>Exact sciences and technology</topic><topic>Observatories</topic><topic>Orbital elements</topic><topic>Orbital evolution</topic><topic>Orbital velocity</topic><topic>Phase shift</topic><topic>Radial velocity</topic><topic>Stars</topic><topic>Telescopes</topic><topic>Variable and peculiar stars (including novae)</topic><topic>Wavelengths</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>WELCH, DOUGLAS L.</creatorcontrib><creatorcontrib>EVANS, NANCY R.</creatorcontrib><creatorcontrib>LYONS, RON W.</creatorcontrib><creatorcontrib>HARRIS, HUGH C.</creatorcontrib><creatorcontrib>BARNES, THOMAS G.</creatorcontrib><creatorcontrib>SLOVAK, MARK H.</creatorcontrib><creatorcontrib>MOFFETT, THOMAS J.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><jtitle>Publications of the Astronomical Society of the Pacific</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>WELCH, DOUGLAS L.</au><au>EVANS, NANCY R.</au><au>LYONS, RON W.</au><au>HARRIS, HUGH C.</au><au>BARNES, THOMAS G.</au><au>SLOVAK, MARK H.</au><au>MOFFETT, THOMAS J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>THE ORBIT OF THE CLASSICAL CEPHEID U AQUILAE</atitle><jtitle>Publications of the Astronomical Society of the Pacific</jtitle><date>1987-07-01</date><risdate>1987</risdate><volume>99</volume><issue>617</issue><spage>610</spage><epage>616</epage><pages>610-616</pages><issn>0004-6280</issn><eissn>1538-3873</eissn><coden>PASPAU</coden><abstract>A total of 62 new radial-velocity observations ofthe classical Cepheid U Aql have been obtained during the interval 1969-86. We present the first determination of a spectroscopic binary orbit for this star. The orbital elements derived from both new and published velocities are: P= 1856.4 ± 4.3 days K1 = 7.81 ± 0.22 km s−1 γ =1.15 ± 0.15 km s−1 e = 0.165 ± 0.027 ω = 190.5 ± 7.7 deg T = 2442754 ± 38 JD a1 sin i = 196.7 ± 5.5 Gm = 1.311 ± 0.037 AU f(m) = 0.0881 ± 0.0074 M⊙ IUE observations reported by Böhm-Vitense and Proffitt (1985) indicate the presence of an early-type main-sequence companion. The orbital elements combined with estimates ofthe companion mass result in upper limits for the mass of the Cepheid in the range 6.4-8.8 M⊙. The possibility of spatially resolving the system using interferometric techniques is discussed.</abstract><cop>Chicago, IL</cop><pub>The Astronomical Society of the Pacific</pub><doi>10.1086/132022</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Astronomy Cepheids Cepheids (delta cephei, w virginis) Earth, ocean, space Ephemerides Exact sciences and technology Observatories Orbital elements Orbital evolution Orbital velocity Phase shift Radial velocity Stars Telescopes Variable and peculiar stars (including novae) Wavelengths |
| title | THE ORBIT OF THE CLASSICAL CEPHEID U AQUILAE |
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