Results 1 to 10 of about 2,833,165 (330)

Beyond Spectroscopy. II. Stellar Parameters for over 20 Million Stars in the Northern Sky from SAGES DR1 and Gaia DR3 [PDF]

The Astrophysical Journal, 2023
We present precise photometric estimates of stellar parameters, including effective temperature, metallicity, luminosity classification, distance, and stellar age, for nearly 26 million stars using the methodology developed in the first paper of this ...
Yang Huang, Timothy C. Beers, Haibo Yuan, Ke-Feng Tan, Wei Wang, Jie Zheng, Chun Li, Young Sun Lee, Hai-Ning Li, Jing-Kun Zhao, Xiang-Xiang Xue, Yujuan Liu, Huawei Zhang, Xue-Ang Sun, Ji Li, Hong-Rui Gu, Christian Wolf, Christopher A. Onken, Jifeng Liu, Zhou Fan, Gang Zhao   +20 more
doaj   +2 more sources

The stellar content and distance of UGC 4483 [PDF]

Monthly Notices of the Royal Astronomical Society, 2001
We present HST/WFPC2 observations of UGC 4483, an irregular galaxy in the M81/NGC 2403 complex. Stellar photometry was carried out with HSTphot, and is complete to V ~ 26.0 and I ~ 24.7. We measure the red giant branch tip at I = 23.56 +/- 0.10 and calculated a distance modulus of (m-M)o = 27.53 +/- 0.12 (corresponding to a distance of 3.2 +/- 0.2 Mpc),
Dolphin, A. E., Makarova, L., Karachentsev, I. D., Karachentseva, V. E., Geisler, D., Grebel, E. K., Guhathakurta, P., Hodge, P. W., Sarajedini, A., Seitzer, P.   +9 more
semanticscholar   +7 more sources

Stellar Distance and Velocity (II)

International Journal of Science and Research (IJSR), 2019
The use of parallax angles is one of the standard methods for determining stellar distance. The problem that arises in using this method is how to measure that angle. In order for the measurement to be correct, it is necessary for the object we are observing to be stationary in relation to the sun. This is generally not true.
Miloš Čojanović
openaire   +5 more sources

Stellar Distance and Velocity

Journal of Applied Mathematics and Physics, 2019
In this paper, a method is presented by which it is possible to determine a distance between the sun and a star as well as a velocity at which the star moves relative to the sun. In order to achieve this, it is sufficient to know three positions of the star and the unit vectors determined by the star and three arbitrarily chosen points that do not lie ...
Miloš Čojanović
openaire   +3 more sources

Resolved Stellar Populations at the Distance of Virgo [PDF]

Proceedings of the International Astronomical Union, 2006
Top of the wish list of any astronomer who wants to understand galaxy formation and evolution is to resolve the stellar populations of a sample of giant elliptical galaxies: to take spectra of the stars and make Colour-Magnitude Diagrams going down to ...
Dennefeld, M., Leibundgut, B., Tolstoy, Eline, Whitelock, P.   +3 more
core   +10 more sources

Stellar twins determine the distance of the Pleiades [PDF]

Astronomy & Astrophysics, 2016
Since the release of the Hipparcos catalog in 1997, the distance to the Pleiades open cluster has been heavily debated. The distance obtained from Hipparcos and those by alternative methods differ by 10 to 15 %. As accurate stellar distances are key to understanding stellar structure and evolution, this dilemma puts the validity of stellar evolution ...
Mädler, Thomas,, Jofré, Paula,, Gilmore, Gerard,, Worley, C. Clare,, Soubiran, C., Blanco-Cuaresma, S., Hawkins, Keith,, Casey, Andrew R.,   +7 more
openaire   +5 more sources

DREAM-Stellar: parallel and space efficient exact local alignment [PDF]

BMC Bioinformatics
Background Searching large genomic data sets for local alignments poses a computational challenge. A particular obstacle is the handling of repetitive sequences that appear in various contexts and incur a high runtime cost. For practical homology search,
Evelin Aasna, Simon Gene Gottlieb, Marcel Ehrhardt, Knut Reinert   +3 more
doaj   +2 more sources

Dynamics of stellar and HI streams in the Milky Way halo

EPJ Web of Conferences, 2012
Stellar streams are key players in many aspects of Milky Way studies and, in particular, studying their orbital dynamics is crucial for furthering our understanding of the Milky Wayʼs gravitational potential.
Jin S.
doaj   +3 more sources

Old-Aged Stellar Population Distance Indicators

, 2018
Old-aged stellar distance indicators are present in all Galactic structures (halo, bulge, disk) and in galaxies of all Hubble types and, thus, are immensely powerful tools for understanding our Universe. Here we present a comprehensive review for three primary standard candles from Population II: (i) RR Lyrae type variables (RRL), (ii) type II Cepheid ...
Beaton, Rachael L., Bono, Giuseppe, Braga, Vittorio Francesco, Dall'Ora, Massimo, Fiorentino, Giuliana, Jang, In Sung, Martínez-Vázquez, Clara E., Matsunaga, Noriyuki, Monelli, Matteo, Neeley, Jillian R., Salaris, Maurizio   +10 more
openaire   +3 more sources

Distance determination for RAVE stars using stellar models [PDF]

Astronomy and Astrophysics, 2010
(Abridged) Aims:We develop a method for deriving distances from spectroscopic data and obtaining full 6D phase-space coordinates for the RAVE survey's second data release. Methods: We used stellar models combined with atmospheric properties from RAVE (Teff, logg and [Fe/H]) and (J-Ks) photometry from archival sources to derive absolute magnitudes.
Watson, Fred G., Zwitter, Tomaž, Wyse, Rosemary F G, Williams, Mary E K, Steinmetz, Matthias, Siviero, Alessandro, Siebert, Arnaud, Seabroke, George M., Parker, Quentin A., Navarro, Julio F., Munari, Ulisse, Grebel, Eva K., Gilmore, Gerard F., Gibson, Brad K., Freeman, Kenneth C., Campbell, Randy D., Burnett, Benedict C M, Boeche, Corrado, Bland-Hawthorn, Joss Bland, Binney, James J., Bienaymé, Olivier, Helmi, Amina, Smith, Martin C., Breddels, Maarten A.   +23 more
openaire   +9 more sources