Results 31 to 40 of about 216,058 (291)

Pulsation in pre-main sequence stars [PDF]

Proceedings of the International Astronomical Union, 2015
AbstractAsteroseismology has been proven to be a successful tool to unravel details of the internal structure for different types of stars in various stages of evolution well after birth. We can now show that it has similar power for pre-main sequence (pre-MS) objects.
openaire   +1 more source

Old pre-main-sequence stars [PDF]

Astronomy & Astrophysics, 2014
Young stars show evidence of accretion discs which evolve quickly and disperse with an e-folding time of $\sim$ 3Myr. This is in striking contrast with recent observations that suggest evidence for numerous $>30$ Myr old stars with an accretion disc in large star-forming complexes.
Scicluna, P, Rosotti, G, Dale, JE, Testi, L   +3 more
openaire   +5 more sources

The Enigmatic, Highly Variable, High-Mass Young Stellar Object Mol 12: A New Extreme Herbig Be (Proto)star

Galaxies
We report new medium-resolution spectroscopy covering the wavelength range from 0.6 to 2.4 μm, as well as multi-epoch, multi-wavelength photometry, of the Class I high-mass embedded young stellar object Mol 12 (IRAS 05373+2349). It is embedded (AV≃12) in
Mauricio Tapia, Paolo Persi, Jesús Hernández, Nuria Calvet   +3 more
doaj   +1 more source

Nothing to hide: An X-ray survey for young stellar objects in the Pipe Nebula

, 2010
We have previously analyzed sensitive mid-infrared observations to establish that the Pipe Nebula has a very low star-formation efficiency. That study focused on YSOs with excess infrared emission (i.e, protostars and pre-main sequence stars with disks),
Agüeros, Bettina Posselt, Brooke, Charles J. Lada, Cieza, Covey, Feigelson, Forbrich, Jan Forbrich, Kenyon, Kevin R. Covey, Lada, Lasker, Muench, Mukai, Neuhäuser, Padgett, Preibisch, Rathborne, Robitaille, Voges, Voges   +21 more
core   +1 more source

Young Stars in the Camelopardalis Dust and Molecular Clouds. VI. YSOs Verified by Spitzer and Akari Infrared Photometry

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

Magnetic Activity–Rotation–Age–Mass Relations in Late-pre-main-sequence Stars

The Astrophysical Journal, 2023
We study the four-dimensional relationships between magnetic activity, rotation, mass, and age for solar-type stars in the age range 5–25 Myr. This is the late-pre-main-sequence (l-PMS) evolutionary phase when rapid changes in a star's interior may lead ...
Konstantin V. Getman, Eric D. Feigelson, Gordon P. Garmire   +2 more
doaj   +1 more source

The pre-main-sequence star IP Persei [PDF]

Astronomy & Astrophysics, 2001
We present the results of high- and low-resolution spectroscopic and broadband multicolour photometric observations of the emission-line A-type star IP Per. Significant variations of the Balmer line profiles and near-IR brightness are detected.
A. S. Miroshnichenko, K. S. Bjorkman, E. L. Chentsov, V. G. Klochkova, R. O. Gray, P. García-Lario, J. V. Perea Calderón   +6 more
openaire   +1 more source

Timescale of Mass Accretion in Pre-Main-Sequence Stars

, 2009
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.
Allen, Barrado y Navascués, Basri, Beristain, Boss, Boss, Bouwman, Briceño, Briceño, Caballero, Carpenter, Clarke, D. Fedele, Dahm, Damjanov, Flaherty, Forbes, Haisch, Haisch, Hartmann, Hartmann, Herczeg, Hernández, Horne, J. M. Oliveira, Jayawardhana, Jeffries, Kharchenko, Lada, Luhman, M. E. van den Ancker, Mentuch, Mohanty, Moraux, Natta, Oliveira, Oliveira, Park, Pollack, R. Jayawardhana, Sana, Schmidt, Sicilia-Aguilar, Sicilia-Aguilar, Sicilia-Aguilar, Th. Henning, Thommes, White, Wilking, Winston, Zapatero Osorio, Zuckerman   +51 more
core   +1 more source

Mapping the evolution of mitochondrial complex I through structural variation

FEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin, Tingting Chen, James A. Letts   +2 more
wiley   +1 more source

Accretion in the Rho-Oph pre-main sequence stars

, 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.
A. Natta, Alexander, Balbus, Barsony, Barsony, Bontemps, Calvet, D'Antona, Doppmann, Feigelson, Greene, Gullbring, Hartmann, Hueso, Imanishi, Johns-Krull, Kenyon, L. Testi, Luhman, Meyer, Muzerolle, Muzerolle, Muzerolle, Muzerolle, Muzerolle, Natta, Natta, Ozawa, Preibisch, Ratzka, S. Randich, Shakura, Siess, Wallace, White, White, Wilking   +36 more
core   +1 more source