The variable star 2. 1902 Lacertae
نویسندگان
چکیده
منابع مشابه
Luminous 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...
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A multi-site, multi-technique campaign on the Be star EW Lac was held for about 9 days in August-September 1993. We present results of the analysis of visual, high S/N spectroscopic data (He I 6678 Å and Hα). Search for shortterm variability was carried out on He I 6678 (line profiles, radial velocity (RV), equivalent width (EW), full width at half-maximum (FWHM) on the absorption part of the l...
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Based on new observations, it is shown here that the amplitude of one of the three well known and stable short periods in the β Cep variable 16 Lac has changed: while the radial modeP1 = 0.16917 d is near its lower amplitude level and the amplitude variation of the non-radial mode P3 = 0.18173 d is still probably in phase with the orbital period, the amplitude of the NR mode P2 = 0.17077 d has ...
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We present VLT long slit optical spectroscopy of the luminous BL Lacertae object PKS 2005-489. The high signal-to-noise ratio and the good spatial resolution of the data allow us to detect the signatures of ongoing star formation in an extended rotating ring, at ∼ 4 kpc from the nucleus. We find that the ring is almost perpendicular to the radio axis and its total star formation rate is ≃ 1 M ⊙...
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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...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1902
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.19021582407