Results 131 to 140 of about 301,064 (245)

Observational astrochemistry: The quest for interstellar molecules

EPJ Web of Conferences, 2012
Over 160 molecular species, not counting isotopologues, have been identified in circumstellar envelopes and interstellar clouds. These species have revealed a wealth of familiar, as much as exotic molecules and in complex organic (and silicon) compounds,
Guélin M.
doaj   +1 more source

The Connection Between Pulsation, Mass Loss and Circumstellar Shells in Classical Cepheids

, 2009
Recent observations of Cepheids using infrared interferometry and Spitzer photometry have detected the presence of circumstellar envelopes (CSE) of dust and it has been hypothesized that the CSE's are due to dust forming in a Cepheid wind.
Chow-Choong Ngeow, Hilding Neilson, John B. Lester, Joyce Ann Guzik, Paul A. Bradley, Shashi Kanbur   +5 more
core   +1 more source

Protostellar Chimney Flues: Are Jets and Outflows Lifting Submillimeter Dust Grains from Disks into Envelopes?

The Astrophysical Journal
Low dust opacity spectral indices ( β < 1) measured in the inner envelopes of class 0/I young stellar objects (age ∼10 ^4–5 yr) have been interpreted as the presence of (sub-)millimeter dust grains in these environments.
L. Cacciapuoti, L. Testi, L. Podio, C. Codella, A. J. Maury, M. De Simone, P. Hennebelle, U. Lebreuilly, R. S. Klessen, S. Molinari   +9 more
doaj   +1 more source

Red and Yellow Hypergiants

Galaxies
The red and yellow hypergiants are a rare and important phase in the evolution of the most massive stars that can reach the cool part of the HR Diagram.
Terry Jones
doaj   +1 more source

Excited-state OH Mainline Masers in AU Geminorum and NML Cygni

, 2007
Excited-state OH maser emission has previously been reported in the circumstellar envelopes of only two evolved stars: the Mira star AU Geminorum and the hypergiant NML Cygni.
Baudry A., Bujarrabal V., Diamond P. J., Engels D., Habing H. J., He J. H., Herman J., Laura K. Zschaechner, Loránt O. Sjouwerman, Mark J. Claussen, Masheder M. R. W., Nguyen, Nyman L., Olnon F. M., Sylvester R. J., Ulvestad J. S., van Genderen A. M., Vincent L. Fish, Ylva M. Pihlström   +18 more
core   +1 more source

Properties of Carbon-rich Asymptotic Giant Branch Stars in the LMC and the Milky Way

The Astrophysical Journal
We present a comparative study of carbon-rich asymptotic giant branch (CAGB) stars in the Large Magellanic Cloud (LMC; 7347 stars) and the Milky Way (7163 stars) using infrared color–magnitude diagrams, spectral energy distributions (SEDs), two-color ...
Kyung-Won Suh
doaj   +1 more source

H2S In Agb Circumstellar Envelopes

, 2017
N ...
openaire   +1 more source

The circumstellar envelope of AFGL 4106

Astronomy & Astrophysics, 1999
10 pages, 11 figures.
van Loon, J.T., Molster, F.J., van Winckel, H., Waters, L.B.F.M.   +3 more
openaire   +3 more sources

Systematic Search for Water Fountain Candidates Using the Databases of Circumstellar Maser Sources

The Astrophysical Journal Supplement Series
Water fountains (WFs) are thought to be objects in the morphological evolution of the circumstellar envelopes of low- and intermediate-mass evolved stars, transitioning from spherically symmetric to asymmetric shapes.
Haichen Fan, Jun-ichi Nakashima, D. Engels, Yong Zhang, Jian-Jie Qiu, Huan-Xue Feng, Jia-Yong Xie, Hiroshi Imai, Chih-Hao Hsia   +8 more
doaj   +1 more source

Molecules and Chemistry in Red Supergiants

Galaxies
The envelopes of Red Supergiants (RSGs) have a unique chemical environment not seen in other types of stars. They foster an oxygen-rich synthesis but are tempered by sporadic and chaotic mass loss, which distorts the envelope and creates complex outflow ...
Lucy M. Ziurys, Anita M. S. Richards
doaj   +1 more source