Results 1 to 10 of about 226,792 (352)
Massive pre-main-sequence stars in M17 [PDF]
Proceedings of the International Astronomical Union, 2016 We obtained VLT/X-shooter spectra of twelve candidate young massive stars previously selected by Hanson et al. (1997) in the giant Hii region M17. An analysis of their spectra using FASTWIND models (Puls et al. 2005) shows that they span a mass range of 6 - 20 M⊙.
Lex Kaper +9 more
core +11 more sources
Rotation and Activity of Pre–Main‐Sequence Stars [PDF]
The Astrophysical Journal, 2007 40 pages, 8 figures, ApJ, in ...
A. Scholz +3 more
core +7 more sources
IRAC Observations of Taurus Pre–Main‐Sequence Stars [PDF]
The Astrophysical Journal, 2005 We present infrared photometry obtained with the IRAC camera on the Spitzer Space Telescope of a sample of 82 pre-main sequence stars and brown dwarfs in the Taurus star-forming region. We find a clear separation in some IRAC color-color diagrams between objects with and without disks. A few ``transition'' objects are noted, which correspond to systems
Giovanni G. Fazio +7 more
core +7 more sources
Timescale of mass accretion in pre-main-sequence stars [PDF]
Astronomy and Astrophysics, 2010 We present initial result of a large spectroscopic survey aimed at measuring the timescale of mass accretion in young, pre-main-sequence stars in the spectral type range K0 - M5. Using multi-object spectroscopy with VIMOS at the VLT we identified the fraction of accreting stars in a number of young stellar clusters and associations of ages between 1 ...
Davide Fedele +5 more
core +7 more sources
Accretion in the $\mathsf{\rho}$-Ophiuchi pre-main sequence stars [PDF]
Astronomy & Astrophysics, 2006 The aim of this paper is to provide a measurement of the mass accretion rate in a large, complete sample of objects in the core of the star forming region Rho-Oph. The sample includes most of the objects (104 out of 111) with evidence of a circumstellar disk from mid-infrared photometry; it covers a stellar mass range from about 0.03 to 3 Msun and it ...
Natta A, Testi L, Randich S
core +8 more sources
PRE-MAIN-SEQUENCE STARS IN THE CEPHEUS FLARE REGION [PDF]
The Astrophysical Journal Supplement Series, 2009 61 pages, 27 figures, 8 tables; accepted for publication by ...
M. Kun +4 more
core +7 more sources
The ages of pre-main-sequence stars [PDF]
Monthly Notices of the Royal Astronomical Society, 1999 The position of pre-main-sequence or protostars in the Hertzsprung--Russell diagram is often used to determine their mass and age by comparison with pre-main-sequence evolution tracks. On the assumption that the stellar models are accurate, we demonstrate that, if the metallicity is known, the mass obtained is a good estimate.
Ian A. Bonnell +2 more
openaire +5 more sources
Pre-Main-Sequence A-type stars [PDF]
Proceedings of the International Astronomical Union, 2004 Young A-type stars in the pre--main-sequence (PMS) evolutionary phase are particularly interesting objects since they cover the mass range (1.5-4 solar ma sses) which is most sensitive to the internal conditions inherited during the protostellar phase. In particular, they undergo a process of thermal relaxation from which they emerge as fully radiative
Marcella Marconi, Francesco Palla
openaire +6 more sources
The Instability Strip for Pre–main-sequence Stars [PDF]
The Astrophysical Journal, 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 solar masses.
Marcella Marconi, Francesco Palla
openaire +6 more sources
Tracing early stellar evolution with asteroseismology: pre-main sequence stars in NGC 2264 [PDF]
EPJ Web of Conferences, 2015 Asteroseismology has been proven to be a successful tool to unravel details of the internal structure for different types of stars in various stages of their main sequence and post-main sequence evolution.
Zwintz Konstanze +4 more
doaj +4 more sources