A CCD photometric study of the late type contact binary EK Comae Berenices
We present CCD photometric observations of the W UMa type contact binary EK Comae Berenices using the 2 m telescope of IUCAA Girawali Observatory, India. The star was classified as a W UMa type binary of subtype-W by Samec et al. (1996). The new V band photometric observations of the star reveal tha...
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| Veröffentlicht in: | New astronomy 2010-11, Vol.15 (8), p.662-668 |
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| creator | Deb, Sukanta Singh, Harinder P. Seshadri, T.R. Gupta, Ranjan |
| description | We present CCD photometric observations of the W UMa type contact binary EK Comae Berenices using the 2
m telescope of
IUCAA Girawali Observatory, India. The star was classified as a W UMa type binary of subtype-W by
Samec et al. (1996). The new V band photometric observations of the star reveal that shape of the light curve has changed significantly from the one observed by
Samec et al. (1996). A detailed analysis of the light curve obtained from the high-precision CCD photometric observations of the star indicates that EK Comae Berenices is not a W-type but an A-type totally eclipsing W UMa contact binary. The photometric mass ratio is determined to be 0.349
±
0.005. A temperature difference of Δ
T
=
141
±
10
K between the components and an orbital inclination of
i[°]
=
89.800
±
0.075 were obtained for the binary system. Absolute values of masses, radii and luminosities are estimated by means of the standard mass-luminosity relation for zero age main-sequence stars. The star shows O’Connell effect, asymmetries in the light curve shape around the primary and secondary maximum. The observed O’Connell effect is explained by the presence of a hot spot on the primary component. |
| doi_str_mv | 10.1016/j.newast.2010.04.005 |
| format | Article |
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m telescope of
IUCAA Girawali Observatory, India. The star was classified as a W UMa type binary of subtype-W by
Samec et al. (1996). The new V band photometric observations of the star reveal that shape of the light curve has changed significantly from the one observed by
Samec et al. (1996). A detailed analysis of the light curve obtained from the high-precision CCD photometric observations of the star indicates that EK Comae Berenices is not a W-type but an A-type totally eclipsing W UMa contact binary. The photometric mass ratio is determined to be 0.349
±
0.005. A temperature difference of Δ
T
=
141
±
10
K between the components and an orbital inclination of
i[°]
=
89.800
±
0.075 were obtained for the binary system. Absolute values of masses, radii and luminosities are estimated by means of the standard mass-luminosity relation for zero age main-sequence stars. The star shows O’Connell effect, asymmetries in the light curve shape around the primary and secondary maximum. The observed O’Connell effect is explained by the presence of a hot spot on the primary component.</description><identifier>ISSN: 1384-1076</identifier><identifier>EISSN: 1384-1092</identifier><identifier>DOI: 10.1016/j.newast.2010.04.005</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Binaries: close ; Stars: evolution ; Stars: individual EK Comae Berenices ; Stars: magnetic fields: Spots</subject><ispartof>New astronomy, 2010-11, Vol.15 (8), p.662-668</ispartof><rights>2010 Elsevier B.V.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c384t-b7db910a26d280115aac274a58449d9447e572c9e9427c90a4fb9115e6e314f43</citedby><cites>FETCH-LOGICAL-c384t-b7db910a26d280115aac274a58449d9447e572c9e9427c90a4fb9115e6e314f43</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.newast.2010.04.005$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,778,782,3539,27907,27908,45978</link.rule.ids></links><search><creatorcontrib>Deb, Sukanta</creatorcontrib><creatorcontrib>Singh, Harinder P.</creatorcontrib><creatorcontrib>Seshadri, T.R.</creatorcontrib><creatorcontrib>Gupta, Ranjan</creatorcontrib><title>A CCD photometric study of the late type contact binary EK Comae Berenices</title><title>New astronomy</title><description>We present CCD photometric observations of the W UMa type contact binary EK Comae Berenices using the 2
m telescope of
IUCAA Girawali Observatory, India. The star was classified as a W UMa type binary of subtype-W by
Samec et al. (1996). The new V band photometric observations of the star reveal that shape of the light curve has changed significantly from the one observed by
Samec et al. (1996). A detailed analysis of the light curve obtained from the high-precision CCD photometric observations of the star indicates that EK Comae Berenices is not a W-type but an A-type totally eclipsing W UMa contact binary. The photometric mass ratio is determined to be 0.349
±
0.005. A temperature difference of Δ
T
=
141
±
10
K between the components and an orbital inclination of
i[°]
=
89.800
±
0.075 were obtained for the binary system. Absolute values of masses, radii and luminosities are estimated by means of the standard mass-luminosity relation for zero age main-sequence stars. The star shows O’Connell effect, asymmetries in the light curve shape around the primary and secondary maximum. The observed O’Connell effect is explained by the presence of a hot spot on the primary component.</description><subject>Binaries: close</subject><subject>Stars: evolution</subject><subject>Stars: individual EK Comae Berenices</subject><subject>Stars: magnetic fields: Spots</subject><issn>1384-1076</issn><issn>1384-1092</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2010</creationdate><recordtype>article</recordtype><recordid>eNp9kEtPwzAQhC0EEuXxDzj4xqlhnThxfEEqoTwrcYGz5Tob1VUSB9sF9d-TKogjp12tZkazHyFXDBIGrLjZJj1-6xCTFMYT8AQgPyIzlpV8zkCmx3-7KE7JWQhbABBMljPysqBVdU-HjYuuw-itoSHu6j11DY0bpK2OSON-QGpcH7WJdG177fd0-Uor12mkd-ixtwbDBTlpdBvw8neek4-H5Xv1NF-9PT5Xi9XcjB3ifC3qtWSg06JOS2As19qkguu85FzWknOBuUiNRMlTYSRo3ox6lmOBGeMNz87J9ZQ7ePe5wxBVZ4PBttU9ul1QIs-KMs_EQcknpfEuBI-NGrztxvaKgTqQU1s1kVMHcgq4GsmNttvJhuMXXxa9CsZib7C2Hk1UtbP_B_wA4GZ3Uw</recordid><startdate>20101101</startdate><enddate>20101101</enddate><creator>Deb, Sukanta</creator><creator>Singh, Harinder P.</creator><creator>Seshadri, T.R.</creator><creator>Gupta, Ranjan</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>20101101</creationdate><title>A CCD photometric study of the late type contact binary EK Comae Berenices</title><author>Deb, Sukanta ; Singh, Harinder P. ; Seshadri, T.R. ; Gupta, Ranjan</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c384t-b7db910a26d280115aac274a58449d9447e572c9e9427c90a4fb9115e6e314f43</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2010</creationdate><topic>Binaries: close</topic><topic>Stars: evolution</topic><topic>Stars: individual EK Comae Berenices</topic><topic>Stars: magnetic fields: Spots</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Deb, Sukanta</creatorcontrib><creatorcontrib>Singh, Harinder P.</creatorcontrib><creatorcontrib>Seshadri, T.R.</creatorcontrib><creatorcontrib>Gupta, Ranjan</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>New astronomy</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Deb, Sukanta</au><au>Singh, Harinder P.</au><au>Seshadri, T.R.</au><au>Gupta, Ranjan</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>A CCD photometric study of the late type contact binary EK Comae Berenices</atitle><jtitle>New astronomy</jtitle><date>2010-11-01</date><risdate>2010</risdate><volume>15</volume><issue>8</issue><spage>662</spage><epage>668</epage><pages>662-668</pages><issn>1384-1076</issn><eissn>1384-1092</eissn><abstract>We present CCD photometric observations of the W UMa type contact binary EK Comae Berenices using the 2
m telescope of
IUCAA Girawali Observatory, India. The star was classified as a W UMa type binary of subtype-W by
Samec et al. (1996). The new V band photometric observations of the star reveal that shape of the light curve has changed significantly from the one observed by
Samec et al. (1996). A detailed analysis of the light curve obtained from the high-precision CCD photometric observations of the star indicates that EK Comae Berenices is not a W-type but an A-type totally eclipsing W UMa contact binary. The photometric mass ratio is determined to be 0.349
±
0.005. A temperature difference of Δ
T
=
141
±
10
K between the components and an orbital inclination of
i[°]
=
89.800
±
0.075 were obtained for the binary system. Absolute values of masses, radii and luminosities are estimated by means of the standard mass-luminosity relation for zero age main-sequence stars. The star shows O’Connell effect, asymmetries in the light curve shape around the primary and secondary maximum. The observed O’Connell effect is explained by the presence of a hot spot on the primary component.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.newast.2010.04.005</doi><tpages>7</tpages><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | Elsevier ScienceDirect Journals Complete - AutoHoldings |
| subjects | Binaries: close Stars: evolution Stars: individual EK Comae Berenices Stars: magnetic fields: Spots |
| title | A CCD photometric study of the late type contact binary EK Comae Berenices |
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