Results 21 to 30 of about 44,379 (345)

Emission-Line Stars in the Vilnius Photometric System [PDF]

Open Astronomy, 1998
Straižys V., Eimontas A., Sūdžius J., Bartašiūtė S., Černis K.   +4 more
doaj   +2 more sources

Wolf-Rayet stars in M33 - II. Optical spectroscopy of emission-line stars in giant H ii regions

Monthly Notices of the Royal Astronomical Society, 2008
We present optical spectra of 14 emission-line stars in M33's giant H II regions NGC 592, 595 and 604: five of them are known Wolf-Rayet (WR) stars, for which we present a better quality spectrogram, eight are WR candidates based on narrow-band ...
Laurent Drissen, Paul A Crowther, Leonardo Ubeda   +2 more
exaly   +1 more source

The Gaia satellite: a tool for Emission Line Stars and Hot Stars

, 2008
The Gaia satellite will be launched at the end of 2011. It will observe at least 1 billion stars, and among them several million emission line stars and hot stars. Gaia will provide parallaxes for each star and spectra for stars till V magnitude equal to
Borges, M., Leroy, Bernard, Jonckheere, A., Martayan, C., Zorec, Jean, Miroshnichenko, A. P., Briot, D., Fremat, Yves, Lanz, Thierry, Floquet, M., Floquet, Michele, Nazé, Yaël, Sordo, Rosanna, Neiner, Coralie, Leroy, B., Martins, Fabrice, Meynet, Georges, Bouret, Jean-Claude, Stee, Philippe, Miroshnichenko, Anatholy, Hubert, Anne-Marie, Miroshnichenko, A., de Batz, B., Bouret, J.-C., Stee, P., Martayan, Christophe, Kolka, Indrek, Kolka, I., Frémat, Y., Briot, Danielle, Blomme, R., Zorec, J., Jonckheere, Anthony, Blomme, Ronny, Leroy, A., Alecian, E., Meynet, G., Zorec, Juan, Neiner, C., Borges, Marcelo, de Batz, Bertrand, Lanz, T., Alecian, Evelyne, Sordo, R., Martins, F.   +44 more
core   +7 more sources

Modelling emission lines in star-forming galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2021
ABSTRACT We present a new model to compute the luminosity of emission lines in star-forming galaxies and apply this in the semi-analytical galaxy formation code galform. The model combines a pre-computed grid of H II region models with an empirical determination of how the properties of H II regions depend on the macroscopic properties ...
C M Baugh, Cedric G Lacey, Violeta Gonzalez-Perez, Giorgio Manzoni   +3 more
openaire   +3 more sources

The Weak Emission Line Stars [PDF]

Symposium - International Astronomical Union, 2003
In this paper, we study the evolution of the weak emission line central stars of planetary nebula (WELS), which are similar to the H-deficient Wolf-Rayet central stars except for systematically weaker emission lines. Our attempts at finding an evolutionary sequence for the WELS similar to what was established for Wolf-Rayet central stars, were ...
Jeffrey Fogel, Orsola De Marco, George Jacoby   +2 more
openaire   +1 more source

Spectroscopic study of late-type emission-line stars using the data from LAMOST DR6 [PDF]

Low-mass emission-line stars belong to various evolutionary stages, from pre-main-sequence young stars to evolved stars. In this work, we present a catalog of late-type (F0 to M9) emission-line stars from the LAMOST Data Release 6.
Nidhi, S., Shridharan, B., Bhattacharyya, Suman, Edwin, D., Valsan, Vineeth, Robin, T., Mathew, Blesson, Kartha, Sreeja S.   +7 more
core   +2 more sources

The GALAH survey : Characterization of emission-line stars with spectral modelling using autoencoders [PDF]

, 2021
We present a neural network autoencoder structure that is able to extract essential latent spectral features from observed spectra and then reconstruct a spectrum from those features.
Buder, Sven, Zwitter, Tomaz,, Kos, J., Kos, Janez,, Bland-Hawthorn, Joss, Čotar, Klemen,, Stello, Dennis,, Nordlander, Thomas,, Galah Collaboration, ., Horner, Jonathan,, Ting, Yuan Sen,, Zerjal, Maruša,, Zwitter, Tomaz, Hayden, Michael R., Bland-Hawthorn, Joss,, Traven, Gregor, Hayden, Michael R.,, Lewis, Geraint Francis, Nordlander, Thomas, Čotar, Klemen, Stello, Dennis, Zwitter, T, Ting, Yuan Sen, Kos, Janez, Zerjal, Maruša, Lewis, Geraint F.,, Cotar, K., Ting, Yuan-Sen, Martell, Sarah L., Buder, Sven,, Hayden, Michael, Martell, Sarah, Lewis, Geraint F., Martell, Sarah L.,, Horner, Jonathan   +34 more
core   +1 more source

Rapid Variability of H α Emission Line in Be Stars [PDF]

Symposium - International Astronomical Union, 1994
We have initiated an observational campaign on some bright Be stars in order to investigate the rapid variability in emission lines using a Fabry-Perot spectrometer(λ/δλ = 104; FSR = 21.3Å) at the Nasmyth focus of the 1.22 m JRO telescope at Hyderabad, India. The PMT dark counts were 1 – 2sec-1. Here we report our first observations on four stars.
B. G. Anandarao, A. Chakraborty, R. Swaminathan, B. Lokanadham   +3 more
openaire   +1 more source

The atypical emission-line star Hen 3-209 [PDF]

Monthly Notices of the Royal Astronomical Society, 2006
6p, 5 fig, accepted for publication in MNRAS (www.blackwell-synergy.com)
Nazé, Yaël, Rauw, Grégor, Hutsemekers, Damien, Gosset, Eric, Manfroid, Jean, Royer, P.   +5 more
openaire   +3 more sources

HYDROGEN LINES IN B-e STARS ENVELOPES

Odessa Astronomical Publications, 2017
The investigation of Balmer Hα and Hb line profiles for 28 Be and Be-shell stars have been carried out. The emission profiles of stars were obtained by subtracting from “A Be star atlas” photospheric line profiles which were computed from Kurucz models ...
S. N. Udovichenko, E. I. Konchagina
doaj   +1 more source