Results 71 to 80 of about 301,064 (245)

SPECTROSCOPIC MONITORING OF THE B[E] OBJECTS FSCMA AND MOCAM

Odessa Astronomical Publications, 2019
Objects with the B[e] phenomenon exhibit permitted and forbidden emission lines due to the presence of circumstellar ionized gas and large infrared excesses due to processing of the stellar radiation by circumstellar dust.
A. K. Kuratova, A. S. Miroshnichenko, S. V. Zharikov, N. Manset, S. A. Khokhlov, A. Raj, A. V. Kusakin, I. V. Reva, R. I. Kokumbaeva, I. A. Usenko, A. Y. Knyazev   +10 more
doaj   +1 more source

A Comprehensive Study of the L1551 IRS 5 Binary System [PDF]

, 2002
We model the Class I source L1551 IRS 5, adopting a flattened infalling envelope surrounding a binary disk system and a circumbinary disk. With our composite model, we calculate self-consistently the spectral energy distribution of each component of the ...
Calvet, N., D'Alessio, P., Hartmann, L., Muzerolle, J., Osorio, M.   +4 more
core   +3 more sources

Photochemical origin of SiC2 in the circumstellar envelope of carbon-rich AGB stars revealed by ALMA

Frontiers in Astronomy and Space Sciences, 2023
The fact that whether SiC2 is a parent species, formed in the photosphere or as a by-product of high-temperature dust formation, or a daughter species, formed in chemistry driven by the photodestruction of the parent species in the outer envelope, has ...
Yanan Feng, Yanan Feng, Xiaohu Li, Xiaohu Li, Tom J. Millar, Ryszard Szczerba, Ke Wang, Donghui Quan, Donghui Quan, Shengli Qin, Shengli Qin, Xuan Fang, Xuan Fang, Xuan Fang, Xuan Fang, Juan Tuo, Juan Tuo, Zhenzhen Miao, Rong Ma, Rong Ma, Fengwei Xu, Fengwei Xu, Jingfei Sun, Biwei Jiang, Biwei Jiang, Qiang Chang, Jianchao Yang, Jianchao Yang, Gao-Lei Hou, Fangfang Li, Yong Zhang, Yong Zhang, Yong Zhang   +32 more
doaj   +1 more source

Polarimetry of Li-rich giants

, 2005
Protoplanetary nebulae typically present non-spherical envelopes. The origin of such geometry is still controversial. There are indications that it may be carried over from an earlier phase of stellar evolution, such as the AGB phase.
A. M. Magalhães, A. Pereyra, B. V. Castilho, Balick, Bessell, Bond, Brown, Carciofi, Castilho, Castilho, Castilho, Castilho, Chapman, Cohen, Collison, Coyne, Coyne, de la Reza, de la Reza, Diamond, Fekel, Greenhill, Gregorio-Hetem, Gregorio-Hetem, Heiles, Ivezic, Johnson, Koornneef, Magalhães, Magalhães, Magalhães, Magalhães, Mermilliod, Parthasaraty, Pereyra, Pereyra, Perryman, Plez, Reddy, Rieke, Serkowski, Trammell, Witt   +42 more
core   +2 more sources

H2O masers in circumstellar envelopes

The Astrophysical Journal, 1987
The spatial structure of H/sub 2/O maser emission at 22.235 GHz for 12-late-type variable stars has been measured with a resolution of 0.07 arcsec. The H/sub 2/O maser regions of Mira variables range from 9 or less to 108 AU in total extent, while those of supergiant long-period variables are 300-720 AU in extent.
Adair P. Lane, K. J. Johnston, J. H. Spencer, P. F. Bowers, P. J. Diamond   +4 more
openaire   +1 more source

Circumstellar molecular line emission from S-type AGB stars: Mass-loss rates and SiO abundances

, 2009
The main aim is to derive reliable mass-loss rates and circumstellar SiO abundances for a sample of 40 S-type AGB stars based on new multi-transitional CO and SiO radio line observations.
Bieging, Bieging, Chen, Cherchneff, Cotton, Danchi, F. L. Schöier, González Delgado, Groenewegen, Groenewegen, Groenewegen, Groenewegen, H. Olofsson, Huggins, Höfner, Höfner, Ivezic, Jorissen, Jura, Justtanont, Kahane, Knapp, Kwok, Lindqvist, Nyman, Olofsson, Olofsson, Ramstedt, Ramstedt, Reid, Reid, S. Ramstedt, Sahai, Salpeter, Scalo, Schöier, Schöier, Schöier, Schöier, Schöier, Schöier, Schöier, Stanek, Stephenson, Stephenson, Suh, van der Tak, Volk, Whitelock, Willems, Wing, Woitke, Young   +52 more
core   +1 more source

Infrared interferometry of circumstellar envelopes [PDF]

Symposium - International Astronomical Union, 1999
This paper will review the technical progress of interferometric infrared observing techniques from the first 2-element interferometer 25 years ago to the 3+ element arrays now coming into service. To date, only the Infrared Spatial Interferometer (ISI) has published separate-element interferometric data on circumstellar dust shells in the infrared and
openaire   +2 more sources

ISO results on circumstellar envelopes [PDF]

Symposium - International Astronomical Union, 1999
This review covers spectroscopic results obtained with ISO on molecular and atomic line emission from the circumstellar envelopes of oxygen-rich AGB stars and post-AGB objects and from cool supergiant stars. As well as the SWS detection of the 4.27-μm CO2 band in absorption and emission from cool star envelopes, several new emission bands which have ...
openaire   +1 more source

Polarized Maser Emission with In-source Faraday Rotation

The Astrophysical Journal, 2023
We discuss studies of polarization in astrophysical masers with particular emphasis on the case where the Zeeman splitting is small compared to the Doppler profile, resulting in a blend of the transitions between magnetic substates.
T. L. Tobin, M. D. Gray, A. J. Kemball
doaj   +1 more source

Fullerenes and fulleranes in circumstellar envelopes

, 2016
Three decades of search have recently led to convincing discoveries of cosmic fullerenes. The presence of C60 and C+60 in both circumstellar and interstellar environments suggests that these molecules and their derivatives can be efficiently formed in ...
Yong Zhang, S. Kwok, S. Sadjadi
semanticscholar   +1 more source