Are pre-main-sequence stars older than we thought? [PDF]
, 2009 We fit the colour-magnitude diagrams of stars between the zero-age main-sequence and terminal-age main sequence in young clusters and associations. The ages we derive are a factor 1.5 to 2 longer than the commonly used ages for these regions, which are ...
Alibert +45 more
core +2 more sources
Dust Envelopes around Massive Young Stellar Objects [PDF]
Journal of Astronomy and Space Sciences, 2008 We investigate the spectral energy distributions (SEDs) of Massive Young Stellar Objects (MYSOs) using the various infrared observational data including the Infrared Space Observatory (ISO) data.
Kyung-Won Suh
doaj +1 more source
On the origin of UV-dim stars: a population of rapidly rotating shell stars? [PDF]
, 2023 The importance of stellar rotation in setting the observed properties of young star clusters has become clearer over the past decade, with rotation being identified as the main cause of the observed extended main sequence turn-off (eMSTO) phenomenon and split main-sequences.
arxiv +1 more source
The effect of starspots on the radii of low-mass pre-main-sequence stars [PDF]
, 2014 A polytropic model is used to investigate the effects of dark photospheric spots on the evo- lution and radii of magnetically active, low-mass (M < 0.5M⊙), pre-main sequence (PMS) stars.
R. Jackson, R. Jeffries
semanticscholar +1 more source
Open Astronomy, 2010 Using photometric data of infrared surveys, young stellar object (YSO) status is verified for 141 objects selected in our previous papers in the Cassiopeia and Camelopardalis segment of the Milky Way bounded by Galactic coordinates (l, b) = (132-158 ...
Straižys V., Kazlauskas A.
doaj +1 more source
Pre-Main Sequence Ap Star LkHα 324/B in LDN 988 Star Forming Region
Universe, 2023 We present results of the investigation of the star LkHα 324/B, which belongs to the starforming dark cloud LDN 988. Based on high resolution spectroscopy, we determined its fundamental parameters as Teff=11,175±130 K, log(L*/L⊙)=1.87±0.07.
Ilya Potravnov +3 more
doaj +1 more source
On the origin of the correlations between the accretion luminosity and emission line luminosities in pre-main-sequence stars [PDF]
, 2015 Correlations between the accretion luminosity and emission line luminosities (Lacc and Lline) of pre-main-sequence (PMS) stars have been published for many different spectral lines, which are used to estimate accretion rates.
I. Mendigut'ia +7 more
semanticscholar +1 more source
The –M disk Relationship for Herbig Ae/Be Stars: A Lifetime Problem for Disks with Low Masses?
The Astronomical Journal, 2023 The accretion of material from protoplanetary disks onto their central stars is a fundamental process in the evolution of these systems and a key diagnostic in constraining the disk lifetime. We analyze the relationship between the stellar accretion rate
Sierra L. Grant +5 more
doaj +1 more source
The theoretical calculation of the Rossby number and the `non-local' convective overturn time for pre-main sequence and early post-main sequence stars [PDF]
, 1995 This paper provides estimates of convective turnover time scales for Sun-like stars in the pre-main sequence and early post-main sequence phases of evolution, based on up-to-date physical input for the stellar models. In this first study, all models have
Yong -Cheol Kim, P. Demarque
semanticscholar +1 more source
Semiregular variables with periods lying between the period-luminosity sequences C', C and D [PDF]
, 2012 We analyze the distribution of semiregular variables and Mira stars in the period-luminosity plane. Our sample consists of 6169 oxygen-rich long-period variables in the Large Magellanic Cloud included in the OGLE-III Catalog of Variable Stars. There are many stars with periods that lie between the well known sequences C and C'.
arxiv +1 more source