Results 111 to 120 of about 36,750 (220)

Are Stars Really Ingesting Their Planets? Examining an Alternative Explanation

The Astrophysical Journal
Numerous stars exhibit surprisingly large variations in their refractory element abundances, often interpreted as signatures of planetary ingestion events.
Nadine H. Soliman, Philip F. Hopkins
doaj   +1 more source

Laboratory Rotational Spectroscopy Leads to the First Interstellar Detection of Singly Deuterated Methyl Mercaptan (CH2DSH)

The Astrophysical Journal Letters
We report an extensive rotational spectroscopic analysis of singly deuterated methyl mercaptan (CH _2 DSH) using both millimeter and far-infrared synchrotron spectra to achieve a global torsional analysis of the three lowest torsional substates ( e _0 ...
Hayley A. Bunn, Silvia Spezzano, Laurent H. Coudert, Jean-Claude Guillemin, Yuxin Lin, Christian P. Endres, Brant Billinghurst, Olivier Pirali, Jes Jørgensen, Valerio Lattanzi, Paola Caselli   +10 more
doaj   +1 more source

Modeling the gas-phase chemistry of the transitional disk around HD 141569A

, 2005
Aims: The chemistry, distribution and mass of the gas in the transitional disk around the 5 Myr old B9.5 V star HD 141569A are constrained. Methods: A quasi 2-dimensional (2D) chemistry code for photon dominated regions (PDR) is used to calculate the ...
Augereau, Augereau, B. Jonkheid, Black, Boccaletti, Brittain, Clampin, Delsemme, Dent, Draine, Draine, E. F. van Dishoeck, Hauschildt, Hogerheijde, I. Kamp, J.-C. Augereau, Jonkheid, Kamp, Kamp, Klahr, Li, Mathis, Merín, Mouillet, Pollack, Rossiter, Shu, Simon, Spaans, Sylvester, Tielens, van Dishoeck, van Dishoeck, Watson, Weinberger, Weinberger, Werner, Wyatt, Zuckerman   +38 more
core   +4 more sources

Experimental Limit to Interstellar 244Pu Abundance

, 2001
10 p, 1 fig, LateX(AASTeX) Accepted for publication in ApJL, aug 2 ...
Paul, M., Valenta, A., Ahmad, I., Berkovits, D., Bordeanu, C., Ghelberg, S., Hashimoto, Y., Hershkowitz, A., Jiang, S., Nakanishi, T., Sakamoto, K.   +10 more
openaire   +2 more sources

Evidence of Rocky Planetesimals Orbiting Two Hyades Stars

, 2013
The Hyades is the nearest open cluster, relatively young and containing numerous A-type stars; its known age, distance, and metallicity make it an ideal site to study planetary systems around 2-3 Msun stars at an epoch similar to the late heavy ...
Farihi, J., Gänsicke, B. T., Koester, D.   +2 more
core   +1 more source

Determining the Physical Properties of the B Stars I. Methodology and First Results

, 1999
We describe a new approach to fitting the UV-to-optical spectra of B stars to model atmospheres and present initial results. Using a sample of lightly reddened stars, we demonstrate that the Kurucz model atmospheres can produce excellent fits to either ...
Azusienis A., Buser R., Castelli F., Cuhna K., Derck Massa, Edward L. Fitzpatrick, Finley D. S., Gummersbach C. A., Hauck B., Hill G. M., Kudritzki R. P., Malagnini M. L., Massa D., Massa D., Mermilliod J. C., Napiwotzki R., Remie H., Rolleston W. R. J., Simonneau E., Swings J. P., Underhill A. B., Varenne O.   +21 more
core   +2 more sources

Interstellar abundances in the neutral and ionized gas of NGC604

, 2006
We present FUSE spectra of the giant HII region NGC604 in the spiral galaxy M33. Chemical abundances are derived from far-UV absorption lines and are compared to those derived from optical emission lines.
A. Aloisi, A. Lecavelier des Étangs, A. Vidal-Madjar, Aloisi, Bluhm, Bohlin, Bowen, Cannon, Churchwell, D. Kunth, Dickey, Dodorico, Esteban, Ferland, Freedman, G. Hébrard, Gonzalez Delgado, Heckman, Heiles, Hobbs, Hoopes, Howk, Hébrard, Israel, Israel, Izotov, J. Lequeux, J.-M. Désert, Jenkins, Kunth, Kunth, Kwitter, Lebouteiller, Lebouteiller, Lecavelier des Etangs, Lemoine, Martin, Maíz-Apellániz, Meixner, Melnick, Miskey, Moos, Morton, Newton, Pellerin, Pettini, Robert, Savage, Snow, Sofia, Tenorio-Tagle, Thuan, Tumlinson, V. Lebouteiller, Velden, Viallefond, Vidal-Madjar, Vilchez, Wilson   +58 more
core   +4 more sources

High-resolution Mid-infrared Spectroscopy of SVS13-A with EXES/SOFIA: The Surprisingly High CH3OH/H2O Ratio in the Planet-forming Zone of a Solar Mass Protostar

The Astrophysical Journal Letters
Water and methanol are key components of interstellar ices and gas in star- and planet-forming regions, but direct observations of water in low-mass protostars are challenging due to atmospheric absorption.
Curtis DeWitt, Marta De Simone, Eleonora Bianchi, Cecilia Ceccarelli, Claudio Codella, Sarah Nickerson, Keeyoon Sung, Albert Rimola, Vittorio Bariosco, Piero Uliengo, Naseem Rangwala   +10 more
doaj   +1 more source

Element Nucleosynthetic Origins from Abundance Spatial Distributions beyond the Milky Way

The Astrophysical Journal Letters
An element’s astrophysical origin should be reflected in the spatial distribution of its abundance, yielding measurably different spatial distributions for elements with different nucleosynthetic sites.
Zefeng Li, Mark R. Krumholz, Anna F. McLeod, A. Mark Swinbank, Emily Wisnioski, J. Trevor Mendel, Francesco Belfiore, Giovanni Cresci, Giacomo Venturi, Jia-Lai Kang   +9 more
doaj   +1 more source

The isotopic abundances of interstellar oxygen

The Astrophysical Journal, 1981
The relative abundance of /sup 17/O and /sup 18/O is found to be remarkably uniform in the giant molecular clouds of our Galaxy, varying by less than approx.5% between the galactic center and the most distant (approx.12 kpc) sources. This uniformity is seen to reflect the close similarity in the galactic distributions of the processes by which these ...
openaire   +1 more source