Results 51 to 60 of about 553,339 (197)
Low-mass companions to nine stars
Acta AstronomicaWe present an independent spectroscopic and radial velocity analysis for nine stars from the Pennsylvania-Toruń Planet Search. For BD+24 4697, we present an updated true companion's mass (0.16$\pm$0.02 \, M$_{\odot}$), as well as evidence of stellar activity.
Niedzielski, A. +7 more
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Pulsation in extremely low mass helium stars [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 AbstractWe explore the stability of extremely low-mass stars (M < 0.25 M⊙) across a wide range of composition, effective temperature, and luminosity. We identify the instability boundaries associated with radial oscillations. These are a strong function of both composition and radial order (0 ≤ n ≤ 13).
C. S. Jeffery, H. Saio
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The Astrophysical JournalSpecifically selected to leverage the unique ultraviolet capabilities of the Hubble Space Telescope, the Hubble Ultraviolet Legacy Library of Young Stars as Essential Standards (ULLYSES) is a Director’s Discretionary program of approximately 1000 orbits ...
Julia Roman-Duval +46 more
doaj +1 more source
The Initial Mass Functions in the Super-Star-Clusters NGC 1569A and NGC 1705-1 [PDF]
, 1998 I use recent photometric and stellar velocity dispersion measurements of the super-star-clusters (SSCs) NGC 1569A and NGC 1705-1 to determine their present-day luminosity/mass (L_V/M) ratios. I then use the inferred L_V/M ratios, together with population
Amiel Sternberg +7 more
core +3 more sources
Rotating Models for Evolved Low-Mass Stars [PDF]
Symposium - International Astronomical Union, 2004 Low mass stars (< 2-2.5 M⊙) exhibit, at all the stages of their evolution, signatures of processes that require challenging modeling beyond the standard stellar theory. In this paper we focus on their peculiarities while they climb the red giant branch (RGB). We first compare the classical predictions for abundance variations due to the first dredge-
Charbonnel, Corinne, Palacios, Ana
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The Astrophysical JournalVariability of millimeter wavelength continuum emission from Class II protoplanetary disks is extremely rare, and when detected, it is usually interpreted as originating from nonthermal emission mechanisms that relate to the host star itself rather than ...
James M. Miley +17 more
doaj +1 more source
Induced formation of primordial low-mass stars [PDF]
New Astronomy, 2004 We show that the explosion of the first supernovae can trigger low-mass star formation via gravitational fragmentation of the supernova-driven gas shell. If the shell mass does not exceed the host galaxy gas mass, all explosions with energies E_SN > 10^{51} erg can lead to shell fragmentation.
Salvaterra, R. +2 more
openaire +2 more sources
Discovery of 118 New Ultracool Dwarf Candidates Using Machine-learning Techniques
The Astronomical JournalWe present the discovery of 118 new ultracool dwarf candidates, discovered using a new machine-learning tool, named SMDET , applied to time-series images from the Wide-field Infrared Survey Explorer.
Hunter Brooks +47 more
doaj +1 more source
COUNTING LOW-MASS STARS IN INTEGRATED LIGHT [PDF]
The Astrophysical Journal, 2012 Low-mass stars (M<0.4Msun) are thought to comprise the bulk of the stellar mass of galaxies but they constitute only of order a percent of the bolometric luminosity of an old stellar population. Directly estimating the number of low-mass stars from integrated flux measurements of old stellar systems is therefore possible but very challenging given ...
Conroy, Charlie, van Dokkum, Pieter
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Starspot Coverage on Two New K-type Low-mass Eclipsing Binaries with Radius Inflation
The Astronomical JournalUtilizing data from the Transiting Exoplanet Survey Satellite (TESS) and LAMOST, we present a photometric and spectroscopic investigation of two new K-type low-mass eclipsing binaries, TIC 56913729 and TIC 97729372.
Yang Pan +4 more
doaj +1 more source