A New, Bright, Short-Period, Emission Line Binary in Ophiuchus

Details A New, Bright, Short-Period, Emission Line Binary in Ophiuchus A New, Bright, Short-Period, Emission Line Binary in Ophiuchus

2008-01-18

arxiv.org/abs/0801.2963v1

Astronomy and Astrophysics

Astrophysics

To be published in AJ, 16 pages, 6 figures. Uses AAS Latex

Scientific paper

10.1088/0004-6256/135/3/991

The 11th magnitude star LS IV -08 3 has been classified previously as an OB star in the Luminous Stars survey, or alternatively as a hot subdwarf. It is actually a binary star. We present spectroscopy, spectroscopic orbital elements, and time series photometry, from observations made at the Kitt Peak National Observatory 2.1m, Steward Observatory 2.3m, MDM Observatory 1.3m and 2.4m, Hobby-Eberly 9.2m, and Michigan State University 0.6m telescopes. The star exhibits emission of varying strength in the cores of H and He I absorption lines. Emission is also present at 4686 Angstroms (He II) and near 4640/4650 Angstroms (N III/C III). Time-series spectroscopy collected from 2005 July to 2007 June shows coherent, periodic radial velocity variations of the H-alpha line, which we interpret as orbital motion with a period of 0.1952894(10) days. High-resolution spectra show that there are two emission components, one broad and one narrow, moving in antiphase, as might arise from an accretion disk and the irradiated face of the mass donor star. Less coherent, low-amplitude photometric variability is also present on a timescale similar to the orbital period. Diffuse interstellar bands indicate considerable reddening, which however is consistent with a distance of ~100-200 pc. The star is the likely counterpart of a weak ROSAT X-ray source, whose properties are consistent with accretion in a cataclysmic variable (CV) binary system. We classify LS IV -08 3 as a new member of the UX UMa subclass of CV stars.

Affiliated with

Also associated with

No associations

Rating

A New, Bright, Short-Period, Emission Line Binary in Ophiuchus does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A New, Bright, Short-Period, Emission Line Binary in Ophiuchus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A New, Bright, Short-Period, Emission Line Binary in Ophiuchus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-18366