Results 21 to 30 of about 3,957,653 (321)

Chromospheric Variations in Main Sequence Stars [PDF]

The Astrophysical Journal, 1976
The work described here is still in progress; hence this paper will be a brief sampling of the results to date.
O. C. Wilson
openalex   +4 more sources

Duplicity on the main sequence [PDF]

Astrophysics and Space Science, 1984
AbstractA review paper or a lecture like the following one, will best serve ‘its’ conference by giving an overview of the basic facts, and an impartial review of current debates, also by trying to point out some apparently crucial questions whose solutions, we hope, will determine the line of future research.Because these stars are essentially ...
openaire   +3 more sources

About time of hydrogen burning in stellar entrails. New formulas for approximation

Вісник Астрономічної школи, 2017
The relationship between the duration of nuclear reactions and initial mass of the star is an important component a wide variety of astrophysical problems.
V. A. Zakhozhay, S. I. Zabuga
doaj   +1 more source

XUE: Molecular Inventory in the Inner Region of an Extremely Irradiated Protoplanetary Disk

The Astrophysical Journal Letters, 2023
We present the first results of the eXtreme UV Environments (XUE) James Webb Space Telescope (JWST) program, which focuses on the characterization of planet-forming disks in massive star-forming regions.
María Claudia Ramírez-Tannus, Arjan Bik, Lars Cuijpers, Rens Waters, Christiane Göppl, Thomas Henning, Inga Kamp, Thomas Preibisch, Konstantin V. Getman, Germán Chaparro, Pablo Cuartas-Restrepo, Alex de Koter, Eric D. Feigelson, Sierra L. Grant, Thomas J. Haworth, Sebastián Hernández, Michael A. Kuhn, Giulia Perotti, Matthew S. Povich, Megan Reiter, Veronica Roccatagliata, Elena Sabbi, Benoît Tabone, Andrew J. Winter, Anna F. McLeod, Roy van Boekel, Sierk E. van Terwisga   +26 more
doaj   +1 more source

Debris disks in main sequence binary systems [PDF]

, 2006
We observed 69 A3-F8 main sequence binary star systems using the Multiband Imaging Photometer for Spitzer onboard the Spitzer Space Telescope. We find emission significantly in excess of predicted photospheric flux levels for 9(+4/-3)% and 40(+7/-6)% of ...
A. Boden, C. A. Beichman, C. H. Chen, C. J. Corbally, D. E. Trilling, Dohnanyi J. W., Dommanget J., Duquennoy A., G. Bryden, G. H. Rieke, Guilloteau S., Heintz W. D., Hog E., J. A. Stansberry, K. R. Stapelfeldt, K. Y. L. Su, Margoni R., Mayor M., Moon T. T., Perryman M. A. C., R. O. Gray, Richichi A., Soderhjelm S., Strassmeier K. G.   +23 more
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Boron Abundances in Main Sequence B-type Stars: A Test of Rotational Depletion during Main Sequence Evolution [PDF]

, 2001
Boron abundances have been derived for seven main sequence B-type stars from HST STIS spectra around the B III 2066 A line. In two stars, boron appears to be undepleted with respect to the presumed initial abundance.
A. M. Brooks, Brown A. G. A., Brown A. G. A., D. J. Lennon, David L. Lambert, Ekberg J. O., F. P. Keenan, Fliegner J., Grebel E. K., Guthrie B. N. G., Hadrava P., Herrero A., Heynderickx D., K. A. Venn, Kilian J., Kilian J., Korotin S. A., Krzesinski J., Lennon D. J., M. Lemke, Maeder A., N. Langer, Olsen E. H., Oosterhoff P. T., Pigulski A., Schoenberner D., Telting J. H., Venn K. A., Vrancken M., Zhai M.   +29 more
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The Pre-main Sequence: Challenges and Prospects for Asteroseismology

Frontiers in Astronomy and Space Sciences, 2022
Stars do not simply pop up on the main sequence. Before the stars arrive on the zero-age main sequence, they form in the collapses of molecular clouds, gain matter through accretion processes, and compress their cores until hydrogen can burn in full ...
Konstanze Zwintz, Thomas Steindl
doaj   +1 more source

The End of the Main Sequence [PDF]

The Astrophysical Journal, 1997
We present stellar evolution calculations for the lowest mass stars, i.e., those stars with masses in the range 0.08 M☉ ≤ M* ≤ 0.25 M☉. Our particular emphasis is on the post-main-sequence evolution of these objects. We establish a hydrogen-burning timescale of τH ~ 1.0 × 1013 years for the minimum-mass main-sequence star. This timescale determines the
Gregory Laughlin, Peter Bodenheimer, Fred C. Adams   +2 more
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Walkaway Star Candidates in IC 348 and Their Possible Birthplaces

The Astrophysical Journal, 2023
Observations and theories reveal that star-forming regions eject their members during the early evolution of the cluster. We present an initial search for stars ejected from the young cluster IC 348 based on an analysis of Gaia EDR3 astrometry of ...
Xingyu Zhou, Gregory J. Herczeg, Min Fang, Xiaolong Wang, Bin B. Ren   +4 more
doaj   +1 more source

Detached white dwarf main-sequence star binaries [PDF]

, 2004
We considered the formation of detached white dwarf main-sequence star (WDMS) binaries through seven evolutionary channels subdivided according to the evolutionary process that gives rise to the formation of the white dwarf or its helium-star progenitor:
B. Willems, Boissier, Bond, Burleigh, Burleigh, Chen, Chen, de Kool, de Kool, de Loore, Farmer, Han, Han, Hillwig, Holberg, Hurley, Hurley, Iben, Iben, Iben, Iben, Iben, Iben, Joss, King, Kolb, Kroupa, Kroupa, Langer, Law, Marsh, Marsh, Maxted, Nelson, Politano, Pols, Pylyser, Pylyser, Rappaport, Raymond, Ritter, Saffer, Sandquist, Savonije, Scalo, Schreiber, Silvestri, Tauris, U. Kolb, van den Heuvel, van der Linden, Vennes, Waters, Webbink, Weidemann, Willems   +55 more
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