Results 1 to 10 of about 71,771 (198)

Horizontal Branch evolution, metallicity and sdB stars [PDF]

Astronomy & Astrophysics, 2011
Context. Abundance anomalies have been observed in field sdB stars and in nearly all Horizontal Branch (HB) stars of globular clusters with Teff > 11 000K whatever be the cluster metallicity. Aims.
Behr, Behr, Behr, Bergeron, Blanchette, Carretta, Charpinet, Charpinet, Charpinet, Charpinet, Charpinet, Cortés, Fabbian, Fontaine, Fontaine, G. Michaud, Geier, Geier, Heber, Hu, Hu, Iglesias, J. Richer, Jeffery, Khalack, Khalack, Kilkenny, Kinman, Kraft, Kupka, LeBlanc, LeBlanc, Marino, Michaud, Michaud, Michaud, Michaud, Michaud, Michaud, Moehler, Morrison, O. Richard, O’Toole, Pace, Quievy, Randall, Richard, Richard, Richard, Richer, Richer, Sargent, Talon, Théado, VandenBerg, Vick   +55 more
core   +6 more sources

Rotation of Horizontal Branch Stars in Globular Clusters [PDF]

The Astrophysical Journal, 1999
The rotation of horizontal branch stars places important constraints on angular momentum evolution in evolved stars and therefore rotational mixing on the giant branch.
Pinsonneault, M., Sills, A.
core   +6 more sources

Photometric identification of blue horizontal branch stars [PDF]

Astronomy & Astrophysics, 2010
We investigate the performance of some common machine learning techniques in identifying BHB stars from photometric data. To train the machine learning algorithms, we use previously published spectroscopic identifications of BHB stars from SDSS data.
Abazajain, Adelman-McCarthy, Bailer-Jones, C. A. L. Bailer-Jones, Cortes, Dorman, Gao, Harris, Hayfield, Huertas-Company, K. W. Smith, Kinman, Marengo, R. J. Klement, Richards, Richards, Schlegel, Sirko, Tsalmantza, Tsalmantza, X. X. Xue, Xue, Xue, Yanny   +23 more
core   +3 more sources

Horizontal Branch Stars [PDF]

Symposium - International Astronomical Union, 1974
The properties of horizontal branch stars depend on the amount of carbon, nitrogen and oxygen that they contain but all theoretical models have difficulty in explaining those stars right at the blue end of the horizontal branch. The length of the theoretical evolutionary tracks always appears to be less than what is observed.
R. J. Tayler, J. E. Hesser
openaire   +2 more sources

Identification of Blue Horizontal-branch Stars from LAMOST DR5

The Astrophysical Journal Supplement Series, 2023
We construct a new catalog of the blue horizontal-branch (BHB) stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) DR5 data set, which contains 5355 + 81 BHB stars at high Galactic latitude (∣Glat∣ > 20°).
Jie Ju, Wenyuan Cui, Zhenyan Huo, Chao Liu, Xiangxiang Xue, Jiaming Liu, Shuai Feng, Mingxu Sun, Linlin Li   +8 more
doaj   +1 more source

A Wide View of the Galactic Globular Cluster NGC 2808: Red Giant and Horizontal Branch Star Spatial Distributions

The Astronomical Journal, 2023
Wide-field and deep DECam multiband photometry, combined with HST data for the core of the Galactic globular cluster NGC 2808, allowed us to study the distribution of various stellar subpopulations and stars in different evolutionary phases out to the ...
Christian I. Johnson, Annalisa Calamida, Justin A. Kader, Ivan Ferraro, Catherine A. Pilachowski, Giuseppe Bono, Alessandra Mastrobuono-Battisti, Armin Rest, Alfredo Zenteno, Alice Zocchi   +9 more
doaj   +1 more source

Red horizontal branch stars: An asteroseismic perspective

Astronomy & Astrophysics, 2023
Robust age estimates of red giant stars are now possible thanks to the precise inference of their mass based on asteroseismic constraints. However, there are cases where such age estimates can be highly precise yet very inaccurate. An example is giants that have undergone mass loss or mass transfer events that have significantly altered their mass.
Massimiliano Matteuzzi, Josefina Montalbán, Andrea Miglio, Mathieu Vrard, Giada Casali, Amalie Stokholm, Marco Tailo, Warrick H. Ball, Walter E. van Rossem, Marica Valentini   +9 more
openaire   +3 more sources

Meet the family − the catalog of known hot subdwarf stars

Open Astronomy, 2017
In preparation for the upcoming all-sky data releases of the Gaia mission, we compiled a catalog of known hot subdwarf stars and candidates drawn from the literature and yet unpublished databases.
Geier Stephan, Østensen Roy H., Nemeth Peter, Heber Ulrich, Gentile Fusillo Nicola P., Gänsicke Boris T., Telting John H., Green Elizabeth M., Schaffenroth Johannes   +8 more
doaj   +2 more sources

Planets around Extreme Horizontal Branch Stars [PDF]

AIP Conference Proceedings, 2011
We review three main results of our recent study: We show that a proper treatment of the tidal interaction prior to the onset of the common envelope (CE) leads to an enhance mass loss. This might increase the survivability of planets and brown dwarfs that enter a CE phase.
Ealeal Bear, Noam Soker, Sonja Schuh, Horst Drechsel, Ulrich Heber   +4 more
openaire   +4 more sources

The horizontal-branch A stars [PDF]

Publications of the Astronomical Society of the Pacific, 1979
The observational determination of astrophysical parameters of horizontal-branch A stars is discussed. Effective temperatures, surface gravities, and bolometric magnitudes are determined for seven field horizontal-branch A stars, and their masses are calculated. The mean mass for these seven stars is 0.6 + or - 0.4 solar mass.
D. S. Hayes, A. G. D. Philip
openaire   +1 more source