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B stars classification Northern standards
With the advent of large spectroscopic surveys, automated stellar parameter determination has become commonplace. Nevertheless, spectral classification still offers a quick and... -
Theoretical spectra of red giants and supergiants
It remains difficult to interpret the near-IR emission of young stellar populations. One main reason is our incomplete understanding of the spectra of luminous red stars. This... -
V1027 Cygni UBV and JHKLM photometry
We present the results of our UBV and JHKLM photometry for the semiregular pulsating variable V1027 Cyg, a supergiant with an infrared excess, over the period from 1997 to 2015... -
IRAS 19336-0400 UBV light curves
We present photoelectric and spectral observations of a hot candidate proto-planetary nebula early B-type supergiant with emission lines in spectrum-IRAS 19336-0400. The light... -
Variability of 3 protoplanetary nebulae
We present new photometric data and analyze long-term UBV observations of three candidates for protoplanetary nebulae - F supergiants with infrared excesses at high Galactic... -
Photometry of FG Sge at the ejection state
New photometric observations of the variable star FG Sge, a rapidly evolving planetary nebula nucleus, were performed in 2003-2008. On 230 nights, we obtained 86 UBV and 155... -
UBV phot. and equivalent widths of V886 Her
We present our long-term photometric and spectroscopic observations of a high-latitude B supergiant with an infrared excess - the protoplanetary nebula IRAS 18062+2410. Our UBV... -
UBV light curves of IRAS 19200+3457
The results of UBV photometric and spectroscopic observations of the early B supergiant with an IR excess IRAS 19200+3457. -
UBV observations of post-AGB supergiants
Systematic UBV observations of six variable post-AGB supergiants in 1991-1999 are presented. -
Alpha Per High res. spectral atlas at 3810-8100{AA}
We present a high resolution (R=90000) spectral atlas of the F5Ib star Alpha Per covering the 3810-8100{AA} region. The atlas, based on data obtained with the aid of the echelle... -
Abundances in 5 post-AGB candidates
A detailed non-LTE study on the abundances of C, N, O, S, and Zn was carried out for five F-G supergiants of suspected post-AGB candidates with IR excesses (HD 112374, HD... -
Spectral line identification in 3 Pup
Optical spectra taken in 1997-2008 are used to analyze the spectral peculiarities and velocity field in the atmosphere of the peculiar supergiant 3 Pup. -
Synthetic spectra of red supergiants with winds
The rate at which mass is lost during the Red Supergiant evolutionary stage may strongly influence how the star appears. Though there have been many studies discussing how RSGs... -
Effect of surface gravity on line-depth ratios
A line-depth ratio (LDR) of two spectral lines with different excitation potentials is expected to be correlated with the effective temperature (T_eff_). It is possible to... -
CO J=2-1 NOEMA observations of mu Cep
Red supergiant stars are surrounded by a gaseous and dusty circumstellar environment created by their mass loss which spreads heavy elements into the interstellar medium. The... -
Luminous cool supergiants in Magellanic Clouds
The empirical upper luminosity boundary L_max_ of cool supergiants, often referred to as the Humphreys-Davidson limit, is thought to encode information on the general mass-loss... -
SAGE SMC evolved stars candidates
The life cycle of dust in the interstellar medium is heavily influenced by outflows from asymptotic giant branch (AGB) and red supergiant (RSG) stars, a large fraction of which... -
Classification of IRS sources in the SMC
The Magellanic clouds are uniquely placed to study the stellar contribution to dust emission. Individual stars can be resolved in these systems even in the mid-infrared, and... -
VY CMa molecular line spectra
We present an analysis of the far-infrared and submillimetre molecular emission-line spectrum of the luminous M-supergiant VY CMa, observed with the Spectral and Photometric... -
NLTE corrections for Mg and Ca lines
We investigate NLTE effects for magnesium and calcium in the atmospheres of late-type giant and supergiant stars. The aim of this paper is to provide a grid of NLTE/LTE...
