منابع مشابه
The first PG 1159 close binary system
The archival spectrum of SDSS J212531.92-010745.9 shows not only the typical signature of a PG 1159 star, but also indicates the presence of a companion. With time-series photometry of SDSS J212531.92-010745.9 during 10 nights, spread over one month, with the Tübingen 80 cm and the Göttingen 50 cm telescopes, the binary nature of this object has recently been proven. An orbital period of 6.9 h ...
متن کاملNew cataclysmic variables from the RASS
We report on a follow-up study of 15 CV candidates, which were discovered by the ROSAT All-Sky Survey and have been identified on the objective prism plates of the Hamburg Quasar Survey so far. For all objects we could obtain low resolution optical spectra confirming 12 CVs. The misidentifications are two quasars and an M-dwarf.
متن کاملThe Pulsating Pre { White Dwarf Star PG 0122 + 200
We present an analysis of single{site time{series photometry of the pulsating pre{white dwarf PG 0122+200. We show the pulsations are consistent with a pattern of modes equally spaced in period; both the observed period range and spacing con rm that PG 0122 is a g{mode pulsator. PG 0122 shows a pattern similar to that seen in multi{site observations of PG 2131+066 and PG 1159{035. The measured ...
متن کاملV405 Peg (rbs 1955): a Nearby, Low-luminosity Cataclysmic Binary
The cataclysmic binary V405 Peg, originally discovered as ROSAT Bright Source (RBS) 1955 (= 1RXS J230949.6+213523), shows a strong contribution from a latetype secondary star in its optical spectrum. This led Schwope et al. (2002) to suggest that it is among the nearest cataclysmic binaries. Here we present extensive optical observations of V405 Peg. Time-series spectroscopy shows the orbital p...
متن کاملModel Atmospheres for Irradiated Stars in Pre-cataclysmic Variables
Model atmospheres have been computed for M dwarfs that are strongly irradiated by nearby hot companions. A variety of primary and secondary spectral types are explored in addition to models specific to four known systems: GD 245, NN Ser, AA Dor, and UU Sge. This work demonstrates that a dramatic temperature inversion is possible on at least one hemisphere of an irradiated M dwarf and the emerge...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20065146