Results 11 to 20 of about 3,873,512 (229)

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 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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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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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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The ALMaQUEST Survey: The Molecular Gas Main Sequence and the Origin of the Star-forming Main Sequence [PDF]

The Astrophysical Journal Letters, 2019
Abstract The origin of the star-forming main sequence (SFMS; i.e., the relation between star formation rate and stellar mass, globally or on kpc scales) remains a hotly debated topic in galaxy evolution. Using the ALMA-MaNGA QUEnching and STar formation (ALMaQUEST) survey, we show that for star-forming spaxels in the main-sequence ...
Lin, L, Pan, HA, Ellison, SL, Belfiore, F, Shi, Y, Sánchez, SF, Hsieh, BC, Rowlands, K, Ramya, S, Thorp, MD, Li, C, Maiolino, R   +11 more
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On the Statistical Properties of the Lower Main Sequence [PDF]

The Astrophysical Journal, 2017
Abstract Astronomy is in an era where all-sky surveys are mapping the Galaxy. The plethora of photometric, spectroscopic, asteroseismic, and astrometric data allows us to characterize the comprising stars in detail. Here we quantify to what extent precise stellar observations reveal information about the properties of a star, including ...
Sarbani Basu, George C. Angelou, George C. Angelou, Saskia Hekker, Saskia Hekker, Earl P. Bellinger   +5 more
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The main sequence of three red supergiant clusters [PDF]

, 2013
Massive clusters in our Galaxy are an ideal testbed to investigate the properties and evolution of high-mass stars. They provide statistically significant samples of massive stars of uniform ages. To accurately determine the intrinsic physical properties
Alexander, Alexander Scholz, Bonatto, Bonatto, Buckner, Clark, Clark, Davies, Davies, Davies, Dirk Froebrich, Figer, Froebrich, Froebrich, Gvaramadze, Indebetouw, Lawrence, Lejeune, Lucas, Marco, Mathis, Negueruela, Negueruela, Oey, Ortolani, Piatti, Rahman, Rieke, Scandariato, Siess, Skrutskie, Stead, Stephenson, Stetson, Westerlund   +34 more
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The Zero Age Main Sequence of WIMP burners [PDF]

, 2007
We modify a stellar structure code to estimate the effect upon the main sequence of the accretion of weakly interacting dark matter onto stars and its subsequent annihilation. The effect upon the stars depends upon whether the energy generation rate from
A. Bouquet, C. J. Hansen, J. Angle, Joakim Edsjö, K. Griest, Malcolm Fairbairn, O. R. Pols, P. Scott, P. P. Eggleton, P. P. Eggleton, Pat Scott   +10 more
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The Instability Strip for Pre--Main-Sequence Stars [PDF]

, 1998
We investigate the pulsational properties of Pre--Main-Sequence (PMS) stars by means of linear and nonlinear calculations. The equilibrium models were taken from models evolved from the protostellar birthline to the ZAMS for masses in the range 1 to 4 ...
Baade D., Breger M., Catala C., Francesco Palla, Gahm G. F., Grinin V. P., Kurtz D. W., Marcella Marconi, van den Ancker M. E., van den Ancker M. E.   +9 more
core   +3 more sources

Quasar Main Sequence in the UV Plane [PDF]

The Astrophysical Journal, 2020
Abstract Active galaxies form a clear pattern in the optical plane showing the correlation between the FWHM of the Hβ line and the ratio of the equivalent width (EW) of the optical Fe ii emission and the broad EW(Hβ). This pattern is frequently referred to as the quasar main sequence. In this paper, we study the UV plane showing the FWHM
Marzena Śniegowska, Szymon Kozłowski, Bożena Czerny, Swayamtrupta Panda, Krzysztof Hryniewicz   +4 more
openaire   +3 more sources