Zobrazeno 1 - 10
of 189
pro vyhledávání: '"Yudin, B."'
Publikováno v:
Mon.Not.Roy.Astron.Soc. 344 (2003) 1233
We report an identification of the lithium resonance doublet LiI 6708A in the spectrum of V407 Cyg, a symbiotic Mira with a pulsation period of about 745 days. The resolution of the spectra used was R~18500 and the measured equivalent width of the li
Externí odkaz:
http://arxiv.org/abs/astro-ph/0306295
One of fundamental questions in relation to symbiotic binaries is the process of mass transfer - Roche lobe overflow or stellar wind - and possibility of an accretion disc formation. The presence of secondary minima in the quiescent light curves of Y
Externí odkaz:
http://arxiv.org/abs/astro-ph/0210492
Publikováno v:
Astron.Astrophys. 394 (2002) 617-624
We present the results of UBVJHKLM photometry of R CrB spanning the period from 1976 to 2001. Studies of the optical light curve have shown no evidence of any stable harmonics in the variations of the stellar emission. In the L band we found semi-reg
Externí odkaz:
http://arxiv.org/abs/astro-ph/0209531
Autor:
Hofmann, K. -H., Beckmann, U., Bloecker, T., Foresto, V. Coude du, Lacasse, M., Mennesson, B., Millan-Gabet, R., Morel, S., Perrin, G., Pras, B., Ruilier, C., Schertl, D., Schoeller, M., Scholz, M., Shenavrin, V., Traub, W., Weigelt, G., Wittkowski, M., Yudin, B.
Publikováno v:
New Astron. 7 (2002) 9
We present K'-band observations of five Mira stars with the IOTA interferometer. The interferograms were obtained with the FLUOR fiber optics beam combiner, which provides high-accuracy visibility measurements in spite of time-variable atmospheric co
Externí odkaz:
http://arxiv.org/abs/astro-ph/0206406
We present and analyze quiescent UBVRI light curves of the classical symbiotic binary YY Her. We show that the secondary minimum, which is clearly visible only in the quiescent VRI light curves, is due to ellipsoidal variability of the red giant comp
Externí odkaz:
http://arxiv.org/abs/astro-ph/0206399
Autor:
Ohnaka, K., Balega, Y., Bloecker, T., Efimov, Y. S., Hofmann, K. -H., Ikhsanov, N. R., Shenavrin, V. I., Weigelt, G., Yudin, B. F.
Publikováno v:
Astronomy & Astrophysics 380, 212-220 (2001)
We present the first speckle interferometric observations of R CrB, the prototype of a class of peculiar stars which undergo irregular declines in their visible light curves. The observations were carried out with the 6m telescope at the Special Astr
Externí odkaz:
http://arxiv.org/abs/astro-ph/0201049
WR 118 is a highly evolved Wolf-Rayet star of the WC10 subtype surrounded by a permanent dust shell absorbing and re-emitting in the infrared a considerable fraction of the stellar luminosity. We present the first diffraction-limited 2.13micron speck
Externí odkaz:
http://arxiv.org/abs/astro-ph/0110132
Autor:
Munari, U., Tomov, T., Yudin, B. F., Marrese, P. M., Zwitter, T., Gratton, R. G., Bonanno, G., Bruno, P., Cali, A., Claudi, R. U., Cosentino, R., Desidera, S., Farisato, G., Martorana, G., Marino, G., Rebeschini, M., Scuderi, S., Timpanaro, M. C.
A highly and rapidly variable bipolar mass outflow from StHa 190 has been discovered, the first time in a yellow symbiotic star. Permitted emission lines are flanked by symmetrical jet features and multi-component P-Cyg profiles, with velocities up t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0102192
Autor:
Hofmann, K. -H., Beckmann, U., Bloecker, T., Foresto, V. Coude du, Lacasse, M., Millan-Gabet, R., Morel, S., Pras, B., Ruilier, C., Schertl, D., Scholz, M., Shenavrin, V., Traub, W., Weigelt, G., Wittkowski, M., Yudin, B.
We present K-band observations of five Mira stars with the IOTA interferometer. The interferograms were obtained with the FLUOR fiber optics beam combiner which provides high-accuracy visibility measurements in spite of time-variable atmospheric cond
Externí odkaz:
http://arxiv.org/abs/astro-ph/0004013
We have obtained I, J, H and K band light curves of the recurrent nova T CrB. We find that we can only fit the $J$ band light curve with a Roche-lobe filling secondary star and a dark spot of radius 11-26 derees (90 per cent confidence) centred at th
Externí odkaz:
http://arxiv.org/abs/astro-ph/9703146