Results 41 to 50 of about 74,495 (201)

StellarGAN: Classifying Stellar Spectra with Generative Adversarial Networks in SDSS and APOGEE Sky Surveys

The Astrophysical Journal Supplement Series
Extracting precise stellar labels is crucial for large spectroscopic surveys like the Sloan Digital Sky Survey (SDSS) and APOGEE. In this paper, we report the newest implementation of StellarGAN, a data-driven method based on generative adversarial ...
Wei Liu, Shuo Cao, Xian-Chuan Yu, Meng Zhu, Marek Biesiada, Jiawen Yao, Minghao Du   +6 more
doaj   +1 more source

The Evolution of Massive Stars. I. Red Supergiants in the Magellanic Clouds

, 2003
We investigate the red supergiant (RSG) content of the SMC and LMC using multi-object spectroscopy on a sample of red stars previously identified by {\it BVR} CCD photometry. We obtained high accuracy ($
Bessell M. S., Bessell M. S., Buser R., Charbonnel C., Chiosi C., Chiosi C., de Jager C., de Loore C., de Loore C., Fagotto F., K. A. G. Olsen, Kudritzki R. P., Kudritzki R. P., Langer N., Maeder A., Maeder A., Meynet G., Oliva E., Pauldrach A., Philip Massey, Puls J., Salasnich B., Sanduleak N., Schaerer D., Schaller G.   +24 more
core   +1 more source

SPIDER VIII – constraints on the stellar initial mass function of early-type galaxies from a variety of spectral features [PDF]

Monthly Notices of the Royal Astronomical Society, 2013
34 pages, 27 figures; V2.
La Barbera, F., Ferreras, I., Vazdekis, A., de la Rosa, I. G., de Carvalho, R. R., Trevisan, M., Falcón-Barroso, J., Ricciardelli, E.   +7 more
openaire   +2 more sources

On the nature of faint Low Surface Brightness galaxies in the Coma cluster [PDF]

, 2008
This project is the continuation of our study of faint Low Surface Brightness Galaxies (fLSBs) in one of the densest nearby galaxy regions known, the Coma cluster.
A. Mazure, Adami, Adami, Adami, Adami, Adami, Adami, Asari, Bertin, Bolzonella, Bruzual, Bruzual, C. Adami, Calzetti, Chabrier, Coleman, Davies, F. Durret, Ilbert, Ilbert, Ilbert, J. C. Cuillandre, J. P. Picat, Kinney, Kodama, Kravtsov, López-Cruz, M. P. Ulmer, McCracken, Neumann, R. Pelló, R. Scheidegger, Roberts, Roberts, Ulmer, van Eymeren, White, White, Wu   +38 more
core   +5 more sources

Variability in stellar granulation and convective blueshift with spectral type and magnetic activity [PDF]

Astronomy & Astrophysics, 2017
12 pages, 9 figures ; accepted in Astronomy and ...
Meunier, N., Mignon, L., Lagrange, A. -M.   +2 more
openaire   +3 more sources

Inferring Stellar Parameters from Iodine-imprinted Keck/HIRES Spectra with Machine Learning

The Astrophysical Journal Letters
The properties of exoplanet host stars are traditionally characterized through a detailed forward-modeling analysis of high-resolution spectra. However, many exoplanet radial velocity surveys employ iodine-cell-calibrated spectrographs, such that the ...
Jude Gussman, Malena Rice
doaj   +1 more source

Listening to stars: audio-inspired multimodal learning for star classification

Frontiers in Astronomy and Space Sciences
Stellar spectral classification plays a crucial role in understanding the intrinsic properties of stars, such as their temperature, composition, and luminosity.
Shengwen Zhang, Shengwen Zhang, Yanxia Zhang, Chao Liu   +3 more
doaj   +1 more source

Optically visible post-AGB/RGB stars and young stellar objects in the Small Magellanic Cloud: candidate selection, spectral energy distributions and spectroscopic examination [PDF]

, 2014
We have carried out a search for optically visible post-AGB candidates in the Small Magellanic Cloud (SMC). We used mid-IR observations from the Spitzer Space Telescope to select optically visible candidates with a mid-IR excess.
Kamath, D., Van Winckel, H., Wood, P. R.
core   +2 more sources

Rotation periods of 12 000 main-sequenceKeplerstars: Dependence on stellar spectral type and comparison withvsiniobservations [PDF]

Astronomy & Astrophysics, 2013
Aims: We aim to measure the starspot rotation periods of active stars in the Kepler field as a function of spectral type and to extend reliable rotation measurements from F-, G-, and K-type to M-type stars. Methods: Using the Lomb-Scargle periodogram we searched more than 150 000 stellar light curves for periodic brightness variations.
Nielsen, M. B.; Gizon, L.; Schunker, H.; Karoff, C.   +4 more
openaire   +6 more sources

Toward Early-type Eclipsing Binaries as Extragalactic Milestones. II. NLTE Spectral Analysis and Stellar Parameters of the Detached O-type System OGLE-LMC-ECL-06782 in the LMC [PDF]

The Astrophysical Journal, 2020
Abstract We combine the NLTE spectral analysis of the detached O-type eclipsing binary OGLE-LMC-ECL-06782 with the analysis of the radial velocity curve and light curve to measure an independent distance to the Large Magellanic Cloud (LMC).
Mónica Taormina, Rolf-Peter Kudritzki, Joachim Puls, Bogumił Pilecki, Eva Sextl, G. Pietrzyński, Miguel A. Urbaneja, Wolfgang Gieren   +7 more
openaire   +2 more sources