BVRI Photometric Light Curves of the Galactic Supersoft X-Ray Source RX J0019.8+2156

Publications of the Astronomical Society of Japan

Matsumoto, Katsura¹ 

[1] Astronomical Institute, Osaka Kyoiku University, Asahigaoka, Kashiwara, Osaka 582 E-mail:

关键词: "Accretion disks";    Photometry;    "Stars: individual (RX J0019.8+2156)";    "X-rays: binaries";   

DOI  :  10.1093/pasj/48.6.827

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

PhotometricobservationsofthegalacticsupersoftX-raysourceRXJ0019.8+2156intheB,V,R,andIbandswerecarriedoutbetweenJulyandDecemberof1995.Theobservedlightcurvesshowperiodicvariations(Period=15.85hr)withanamplitudeofaround0.5maginallfourbands,whilecolorcurves(B–V,V–R,andV–I)showvirtuallynovariationthroughoutthecycle.Wefindasecondaryminimumwhichishighlyvariableinitsshapefromonecycletoanother.Thehumpbeforethesecondaryminimum(phase∼0.3–0.4)isbrighterbyabout0.1magcomparedtothatseenafterthesecondaryminimum(phase∼0.6–0.7).Theprimaryminimumappearstobestableindepthonatimescaleofseveralmonths.Furthermore,changesinbrightnessofabout0.15magareobservedfromonecycletoanotherwithoutdetectablevariationinthecolors.Thetimescaleoftheseirregularfluctuationsisaboutoneweekorshorter.

【 授权许可】

Unknown