THE GLOBULAR CLUSTER M15. I. IDENTIFICATION, DISCOVERY, AND PERIOD DETERMINATION OF VARIABLE STARS
نویسندگان
چکیده
منابع مشابه
Variable Stars in the Field of the Globular Cluster Ngc
We report on the discovery and analysis of 14 short-period variable stars in the field of the southern globular cluster NGC 3201, located within roughly two magnitudes on either side of the main-sequence turnoff. 11 of these variable stars are eclipsing binaries, one is an RR Lyrae, and two are thus far unclassified systems. Among the eclipsing binary stars, nine are of the W Ursa Majoris (W UM...
متن کاملThe Discovery of a Very Faint X-ray Transient in the Globular Cluster M15
We have identified an X-ray transient (hereafter M15 X-3) in the globular cluster M15 from an archival Chandra grating observation. M15 X-3 appears at an X-ray luminosity of 6 × 10 ergs s with a spectrum consistent with an absorbed power law of photon index 1.51±0.14. The object is identifiable in archival Chandra HRC-I observations with an X-ray luminosity of 2− 6× 10 ergs s and apparently sof...
متن کاملPhotometry of Variable Stars in the Globular Cluster NGC 6397
Time series BV I photometry is presented for 16 short-period variables located in the central region of the globular cluster NGC 6397. The sample includes 9 newly detected variables. The light curve of cataclysmic variable CV6 shows variability with a period of 0.2356 days. We confirm an earlier reported period of 0.472 days for cataclysmic variable CV1. Phased light curves of both CVs exhibit ...
متن کاملSearch for variable stars in the globular cluster M 3
We describe here results of a photometric time-sequence survey of the globular cluster M3 (NGC 5272), in a search for contact and detached eclipsing binary stars. We have discovered only one likely eclipsing binary and one SX Phe type star in spite of monitoring 4077 stars with V < 20.0 and observing 25 BSS. The newly identified SX Phe star, V237, shows a light curve with a variable amplitude. ...
متن کاملNeutron-capture Elements in the Metal-poor Globular Cluster M15
We report on observations of six giants in the globular cluster M15 (NGC 7078) using the Subaru Telescope to measure neutron-capture elemental abundances. Our abundance analyses based on high-quality blue spectra confirm the star-to-star scatter in the abundances of heavy neutron-capture elements (e.g., Eu), and no significant s-process contribution to them, as was found in previous studies. We...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2008
ISSN: 0004-6256,1538-3881
DOI: 10.1088/0004-6256/135/4/1459