Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Reads History
·
· Translate This Page
Title:
A New, Bright, Short-period, Emission Line Binary in Ophiuchus
Authors:
Stark, Michele A.; Wade, R. A.; Thorstensen, J. R.; Peters, C. S.; Sheets, H. A.; Smith, H. A.; Miller, R. D.; Green, E. M.
Affiliation:
AA(University of Wyoming), AB(Penn State Univ), AC(Dartmouth Coll), AD(Dartmouth Coll), AE(Dartmouth Coll), AF(Michigan State Univ), AG(Michigan State Univ), AH(Steward Observatory)
Publication:
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, id.09.07; Bulletin of the American Astronomical Society, Vol. 38, p.908
Publication Date:
12/2006
Origin:
AAS
Bibliographic Code:
2006AAS...209.0907S

Abstract

The 11th magnitude star LS IV -08d 3 has been classified as an OB star in the Luminous Stars survey, or alternatively as a hot subdwarf. The star may be the counterpart of a weak ROSAT X-ray source. We initially observed it as part of a program on composite-spectrum hot subdwarf stars, owing to its red observed optical and near-IR colors. We found emission in the cores of H and He I absorption lines. Emission is also present from He II 468.6 nm and near 465 nm (C III or N III). Diffuse interstellar bands indicate considerable reddening. Time-series spectroscopy collected from June 2004 to March 2006 shows coherent, periodic radial velocity variations of the H-alpha line, which we interpret as orbital motion with a 0.2d period. There is less coherent, low-amplitude photometric variability on a similar timescale. We will present our findings, including spectra, the spectroscopic orbital elements, and time series photometry, from observations made at the KPNO 2.1m, Steward 2.3m, HET 9.2m, MDM 1.3m and 2.4m, and MSU 0.6m telescopes. Many aspects of this star are consistent with those of a novalike cataclysmic variable, although other interpretations may be possible. Partially supported by NASA and NSF.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
  New!

Find Similar Abstracts:

Use: Authors
Title
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints