Results 81 to 90 of about 8,488 (185)

Evaluating Gaia Astrometric Quality and Distances for Galactic Hot Supergiants

Universe
Distances to Galactic BA supergiants are essential for determining their luminosities, radii, and positions on the Hertzsprung–Russell diagram, yet Gaia parallaxes for these bright, extended sources are often affected by systematics.
Nadezhda L. Vaidman, Shakhida T. Nurmakhametova, Aziza B. Umirova, Serik A. Khokhlov, Aldiyar T. Agishev, Berik S. Yermekbayev   +5 more
doaj   +1 more source

A Test Of Pre-Main-Sequence Lithium Depletion Models [PDF]

, 2010
Despite the extensive study of lithium depletion during pre-main-sequence (PMS) contraction, studies of individual stars show discrepancies between ages determined from the Hertzsprung-Russell (H-R) diagram and ages determined from lithium depletion ...
Jensen, Eric L.N., Yee, Jennifer Chun Ming, , \u2707   +1 more
core   +1 more source

Carbon burning in intermediate mass primordial stars

, 2004
The evolution of a zero metallicity 9 M_s star is computed, analyzed and compared with that of a solar metallicity star of identical ZAMS mass. Our computations range from the main sequence until the formation of a massive oxygen-neon white dwarf ...
Fujimoto, M. Y., Garcia-Berro, E., Gil-Pons, P., Suda, T.   +3 more
core   +1 more source

The Internal Kinematics of NGC 2808 and Its Multiple Populations

The Astrophysical Journal
We use new Hubble Space Telescope observations coupled with archival data spanning a total temporal baseline of 17 yr to study the internal kinematics of the multiple populations in the globular cluster NGC 2808 from its center out to ∼8 half-light radii
M. Griggio, A. Bellini, F. I. Aros, E. Vesperini, M. Libralato, J. Anderson, H. Baumgardt, F. R. Ferraro, R. P. van der Marel, S. Raso, A. Renzini, A. Rest, R. E. Ryan Jr.   +12 more
doaj   +1 more source

The imprint of star formation on stellar pulsations. [PDF]

Nat Commun, 2022
Steindl T, Zwintz K, Vorobyov E.
europepmc   +1 more source

Mapping the core of the Tarantula Nebula with VLT-MUSE II. The spectroscopic Hertzsprung-Russell diagram of OB stars in NGC 2070 [PDF]

, 2021
N. Castro, P. A. Crowther, C. J. Evans, J. S. Vink, J. Puls, A. Herrero, M. García, F. Selman, Martin M. Roth, S. Simón‐Díaz   +9 more
openalex   +1 more source

The evolution of planetary nebulae IV. On the physics of the luminosity function

, 2007
The nebular evolution is followed from the vicinity of the asymptotic-giant branch across the Hertzsprung-Russell diagram until the white-dwarf domain is reached, using various central-star models coupled to different initial envelope configurations ...
Blöcker, C. Sandin, Chevalier, Ciardullo, Corradi, D. Schönberner, Dopita, Dopita, Dopita, Dopita, Franco, Gabler, Gesicki, Gruenwald, Górny, Herwig, Herwig, Herwig, Latter, Leuenhagen, M. Steffen, Marigo, Marigo, Marten, Meatheringham, Meatheringham, Méndez, Méndez, Méndez, Paczynski, Perinotto, Perinotto, R. Jacob, Schönberner, Schönberner, Schönberner, Shaw, Shu, Stanghellini, Stasinska, Steffen, Vassiliadis, Vilkoviskii, Volk, Weinberger, Zhang   +45 more
core   +1 more source

A Systematic Search for Redback and Black Widow Candidates Based on the 4FGL-DR3 Unassociated Sources and the Zwicky Transient Facility Data

The Astrophysical Journal
Spider pulsars represent a unique subclass of radio millisecond pulsars in binaries, and are further categorized into black widows and redbacks according to the mass of the low-mass companion.
Chunyan Lu, Liangliang Ren, Jiamao Lin, Wenjun Huang, Hewen Yang, P. H. Thomas Tam   +5 more
doaj   +1 more source

On the new late B- and early A-type periodic variable stars [PDF]

, 2017
We summarize the properties of the new periodic, small-amplitude, variable stars recently discovered in the open cluster NGC 3766. They are located in the region of the Hertzsprung-Russell diagram between δ Sct and slowly pulsating B stars, a region ...
Barblan, Fabio, Eyer, Laurent, Mowlavi, Nami, Saesen, Sophie   +3 more
core   +1 more source

Binary interactions as a possible scenario for the formation of multiple stellar populations in globular clusters

, 2014
Observations revealed the presence of multiple stellar populations in globular clusters (GCs) that exhibit wide abundance variations and multiple sequences in Hertzsprung-Russell (HR) diagram.
Han, Zhanwen, Jiang, Dengkai, Li, Lifang
core   +1 more source