Results 1 to 10 of about 614,429 (304)

Violent mergers revisited: The origin of the fastest stars in the Galaxy

Astronomy & Astrophysics
Binary systems of two carbon-oxygen white dwarfs are one of the most promising candidates for the progenitor systems of Type Ia supernovae. Violent mergers, where the primary white dwarf ignites when the secondary white dwarf smashes into it while being ...
Pakmor Rüdiger, Shen Ken J., Bhat Aakash, Rajamuthukumar Abinaya Swaruba, Collins Christine E., O’Donnell Cillian, Bauer Evan B., Callan Fionntan P., Röpke Friedrich K., Pollin Joshua M., Maguire Kate, Kwok Lindsey A., Seth Ravi, Taubenberger Stefan, Justham Stephen   +14 more
doaj   +1 more source

Thermal Abundances of Heavy Particles [PDF]

, 2000
Matsumoto and Yoshimura [hep-ph/9910393] have argued that there are loop corrections to the number density of heavy particles (in thermal equilibrium with a gas of light particles) that are not Boltzmann suppressed by a factor of e^(-M/T) at temperatures
A. Singh, J. I. Kapusta, Mark Srednicki, Sh. Matsumoto, Sh. Matsumoto, Sh. Matsumoto   +5 more
core   +2 more sources

The Metallicity and Distance of Leo A from Blue Supergiants

The Astrophysical Journal, 2023
We have obtained high-quality spectra of blue supergiant candidates in the dwarf irregular galaxy Leo A with the Low Resolution Imaging Spectrometer at the Keck I telescope.
Miguel A. Urbaneja, Fabio Bresolin, Rolf-Peter Kudritzki   +2 more
doaj   +1 more source

Selecting a Photometric System for Gaia: C, N, O and Alpha-Process Elements

Open Astronomy, 2003
The sensitivity of stellar spectra to C, N, O and α-process element abundances is discussed with the aim of taking this effect into account when selecting a photometric system for the Gaia orbiting observatory.
Tautvaišienė G., Edvardsson B., Bartašiūtė S.   +2 more
doaj   +1 more source

How Clumpy Star Formation Affects Globular Cluster Systems

Galaxies, 2017
There is now clear evidence the metallicities of globular clusters are not simple tracers of the elemental abundances in their protocluster clouds; some of the heavy elements were formed subsequently within the cluster itself. It is also manifestly clear
Jeremy Bailin
doaj   +1 more source

Gas-grain models for interstellar anion chemistry

, 2012
Long-chain hydrocarbon anions CnH- (n=4, 6, 8) have recently been found to be abundant in a variety of interstellar clouds. In order to explain their large abundances in the denser (prestellar/protostellar) environments, new chemical models are ...
Brown, Brown, Brünken, Caselli, Cernicharo, Charnley, Cordiner, Cordiner, Cordiner, Crapsi, Eichelberger, Gupta, Harada, Hasegawa, Hassel, Herbst, Lee, Lee, Leger, M. A. Cordiner, McCarthy, Millar, Peeters, Remijan, Roberts, S. B. Charnley, Sakai, Sakai, Sakai, Thaddeus, Umebayashi, Wakelam, Walsh, Öberg   +33 more
core   +1 more source

"Counterpart" method for abundance determinations in HII regions

, 2012
We suggest a new way of the determining abundances and electron temperatures in HII regions from strong emission lines. Our approach is based on the standard assumption that HII regions with similar intensities of strong emission lines have similar ...
Aggarwal, Alloin, Andrievsky, Andrievsky, Andrievsky, Andrievsky, Asplund, Baldwin, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Campbell, Castellanos, Cid, de Blok, Dopita, Dufour, E. K. Grebel, Edlén, Esteban, Esteban, Ferguson, Fierro, French, Fricke, Froese, Galavís, García-Rojas, García-Rojas, García-Rojas, García-Rojas, Garnett, Garnett, Garnett, Goddard, González-Delgado, Guseva, Guseva, Guseva, Guseva, Guseva, Guseva, Guseva, Hawley, Henry, Hodge, Hudson, Hägele, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Izotov, Johansson, Kauffmann, Kehrig, Kehrig, Kennicutt, Kennicutt, Kewley, Kewley, Kewley, Kinkel, Kniazev, Kniazev, Kobulnicky, Kobulnicky, Kunth, Kwitter, L. Mattsson, L. S. Pilyugin, Lee, Lee, Lee, Lee, Lequeux, Luridiana, López-Sánchez, López-Sánchez, López-Sánchez, López-Sánchez, López-Sánchez, Maeder, Magrini, Mattsson, McCall, McGaugh, Melbourne, Melnick, Mendoza, Miller, Moustakas, Noeske, Pagel, Pagel, Pagel, Pagel, Pastoriza, Peimbert, Peimbert, Peimbert, Peimbert, Peimbert, Pettini, Peña, Peña-Guerrero, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Popescu, Pradhan, Pustilnik, Pustilnik, Pustilnik, Pustilnik, Pustilnik, Pérez-Montero, Rayo, Rodríguez, Saviane, Sedwick, Skillman, Skillman, Skillman, Stanghellini, Stasińska, Stasińska, Stasińska, Stasińska, Storey, Tayal, Terlevich, Thuan, Thuan, Thuan, Torres-Peimbert, Tremonti, Tsamis, Tüllmann, van den, van Zee, van Zee, van Zee, van Zee, van Zee, Vila Costas, Vílchez, Vílchez, Webster, Wenåker, Williams, Yin, York, Zahid, Zaritsky, Zaritsky   +175 more
core   +1 more source

Rubidium and zirconium abundances in massive Galactic asymptotic giant branch stars revisited [PDF]

, 2017
Luminous Galactic OH/IR stars have been identified as massive (>4-5 M_s) AGB stars experiencing HBB and Li production. Their Rb abundances and [Rb/Zr] ratios derived from hydrostatic model atmospheres, are significantly higher than predictions from AGB ...
Garcia-Hernandez, D. A., Karakas, A. I., Lugaro, M., Manchado, A., Perez-Mesa, V., Plez, B., Zamora, O.   +6 more
core   +3 more sources

BBN and the Primordial Abundances

, 2005
The relic abundances of the light elements synthesized during the first few minutes of the evolution of the Universe provide unique probes of cosmology and the building blocks for stellar and galactic chemical evolution, while also enabling constraints ...
C. Chiappini, D. Kirkman, D.N. Spergel, G. Steigman, G. Steigman, I. Iben, J. Lequeux, J. Melendez, J.A. Thorburn, J.N. Bahcall, J.P. Kneller, K.A. Olive, L. Randall, M. Kawasaki, M.H. Pinsonneault, P. Bonifacio, R.T. Rood, S. Cassisi, S.G. Ryan, S.M. Viegas, T.M. Bania, V. Barger   +21 more
core   +2 more sources

Beryllium anomalies in solar-type field stars

, 2004
We present a study of beryllium (Be) abundances in a large sample of field solar-type dwarfs and sub-giants spanning a large range of effective temperatures.
Allende Prieto, Anders, Balachandram, Barnes, Boesgaard, Boesgaard, Boesgaard, Boesgaard, Boesgaard, Chen, Chmielewski, Da Silva, Deliyannis, Deliyannis, Deliyannis, G. Israelian, García López, García López, García López, Gonzalez, Gonzalez, Gonzalez, Grevesse, Henry, Huensch, Israelian, Israelian, Jones, Molaro, Montalban, Murray, N. C. Santos, Naef, Pasquini, Pasquini, Pinsonneault, Primas, Quillen, R. J. García López, R. Rebolo, Ramaty, Randich, Randich, Randich, Rebolo, Reeves, Rocha-Pinto, S. Randich, Santos, Santos, Santos, Santos, Soderblom, Soderblom, Stephens, Swenson, Vaughan, Vaughan   +57 more
core   +1 more source