منابع مشابه
Optical spectroscopy of the dwarf nova U Geminorum
The dwarf nova U Gem is unique in having a direct measurement of the K-velocity of its white dwarf from HST spectra (K 1 = 107 ± 2 km s −1 , Long et al. 1999). We present high-resolution optical spectra of the dwarf nova U Gem in quiescence taken to test the accuracy to which the HST value can be recovered from optical data. We find that, even with data of very high signal-to-noise ratio on thi...
متن کاملLong-term changes of the Be star OT Geminorum
We investigate the character of light variability of the bright Be star OT Gem. Two phases of the long-term light changes were distinguished: – a quiet phase which is characterized by mild light changes; and – an active phase in which the sudden increases of brightness up to 0. m 4 in V occur. During the active phases, a cyclic oscillation of brightness of a period between 70 and 80 days is pre...
متن کاملNova Geminorum No. 2 as a Wolf-Rayet Star.
It has been known for many years that the spectrum of temporary stars or Novae develops in a later stage into a spectrum nearly identical with that of planetary nebulae. First observed in the case of Nova Aurigae of 1891, the same result has been found to hold for all of the temporary stars observed since that time, including the most important Nova of recent years, Nova Persei of 1901. The que...
متن کاملOn the pulsation parallax of the variable star RR Lyr
We show that a straightforward application of the predicted relation connecting the absolute K magnitude of fundamental RR Lyrae variables to their period and metal content, together with current evolutionary predictions on the mass and luminos-ity of Horizontal Branch stars, supply a distance estimate to the prototype star RR Lyr in close agreement with the recent parallax determination by HST...
متن کاملLuminous Red Variable Star
We report photometry and spectroscopy of the evolution of Nova Sagittarii 1994 #1 (V4332 Sagittarii) during outburst. We compare the photometric and spectral evolution of this outburst to known classes of outbursts – including classical novae and outbursts occurring on symbiotic stars – and find this object does not conform to any known class of outburst. The closest match to the behavior of th...
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: Monthly Notices of the Royal Astronomical Society
سال: 1878
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/38.5.334