Results 21 to 30 of about 8,488 (185)
Rotation of solar‐like stars in the immediate solar neighborhood
Astronomische Nachrichten, Volume 341, Issue 5, Page 497-507, June 2020., 2020 Abstract Although photometric space‐based missions such as CoRoT or Kepler have yielded rotation measurements of many thousands of late‐type stars during the last decade, the rotational properties of the bulk of the G star population remain undetected by these missions.
Jürgen H. M. M. Schmitt, Marco Mittag
wiley +1 more source
Modified Least Trimmed Quantile Regression to Overcome Effects of Leverage Points
Mathematical Problems in Engineering, Volume 2020, Issue 1, 2020., 2020 Quantile regression estimates are robust for outliers in y direction but are sensitive to leverage points. The least trimmed quantile regression (LTQReg) method is put forward to overcome the effect of leverage points. The LTQReg method trims higher residuals based on trimming percentage specified by the data.
Habshah Midi +3 more
wiley +1 more source
Resonant Mode Coupling in δ Scuti Stars
The Astrophysical Journal, 2023 Delta Scuti ( δ Sct) variables are intermediate-mass stars that lie at the intersection of the main sequence and the instability strip on the Hertzsprung–Russell diagram.
Mohammed Mourabit, Nevin N. Weinberg
doaj +1 more source
Age spreads in star forming regions? [PDF]
, 2008 Rotation periods and projected equatorial velocities of pre-main-sequence (PMS) stars in star forming regions can be combined to give projected stellar radii. Assuming random axial orientation, a Monte-Carlo model is used to illustrate that distributions
D'Antona +5 more
core +1 more source
The Astrophysical Journal, 2023 We present the lifetime star formation histories (SFHs) for six ultrafaint dwarf (UFD; M _V > − 7.0, $4.9\lt {\mathrm{log}}_{10}({M}_{* }(z=0)/{M}_{\odot })\lt 5.5$ ) satellite galaxies of M31 based on deep color–magnitude diagrams constructed from ...
Alessandro Savino +36 more
doaj +1 more source
Energetic properties of stellar pulsations across the Hertzsprung-Russell diagram
EPJ Web of Conferences, 2015 I will review types of modes which are observed in stars with different masses and on various evolutionary stages. In particular, I will focus on energetic aspects of oscillation modes, i.e., excitation, distribution of kinetic energy, mode amplitude and
Daszyńska-Daszkiewicz Jadwiga
doaj +1 more source
On the Modeling of Algol-Type Binaries
Galaxies, 2021 In earlier papers, we presented a binary evolutionary code for the purpose of reproducing the orbital parameters, masses, radii, and location in the Hertzsprung Russell diagram (abbreviated as HRD) of well-observed Algol systems.
Walter van Rensbergen +1 more
doaj +1 more source
Asteroseismology with the WIRE satellite [PDF]
, 2007 I give a summary of results from the WIRE satellite, which has been used to observe bright stars from 1999-2000 and 2003-2006. The WIRE targets are monitored for up to five weeks with a duty cycle of 30-40%.
H. Bruntt, Michel Breger
core +2 more sources
STIS spectroscopy of newborn massive stars in SMC N81 [PDF]
, 2001 Using Hubble Space Telescope observations with STIS, we study the main exciting stars of N81, a high excitation compact Hii region in the Small Magellanic Cloud (SMC).
Beech +46 more
core +2 more sources
Resolving stellar populations with integral field spectroscopy
Astronomische Nachrichten, Volume 340, Issue 9-10, Page 989-995, November‐December 2019., 2019 Abstract High‐performance instruments at large ground‐based telescopes have made integral field spectroscopy (IFS) a powerful tool for the study of extended objects such as galaxies, nebulae, or even larger survey fields on the sky. Here, we discuss the capabilities of IFS for the study of resolved stellar populations, using the new method of point ...
Martin M. Roth +2 more
wiley +1 more source