Abstract
A survey with the Heinrich Hertz Submillimeter Telescope of HCN emission from mass-losing carbon stars has revealed masers in the J = 3-2 and 4-3 transitions of the (011c0) vibrational bending mode. These lines have not previously been known to show maser action. Five stars - R Scl, V384 Per, R Lep, Y CVn, and V Cyg - out of 12 observed were detected as masers. Allowing for evidence of variability, this detection rate suggests that these HCN lines are masers at least some of the time in the majority of mass-losing carbon stars. The line widths and velocities imply that the maser action occurs in gas close to the star, where the circumstellar envelope is just being accelerated outward.
| Original language | English (US) |
|---|---|
| Journal | Astrophysical Journal |
| Volume | 549 |
| Issue number | 1 PART 2 |
| DOIs | |
| State | Published - Mar 1 2001 |
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Keywords
- Masers
- Molecular processes
- Radio lines: Stars
- Stars: Carbon
- Stars: Mass loss
ASJC Scopus subject areas
- Space and Planetary Science
Cite this
Discovery of two new HCN maser lines in five carbon stars. / Bieging, John H.
In: Astrophysical Journal, Vol. 549, No. 1 PART 2, 01.03.2001.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Discovery of two new HCN maser lines in five carbon stars
AU - Bieging, John H
PY - 2001/3/1
Y1 - 2001/3/1
N2 - A survey with the Heinrich Hertz Submillimeter Telescope of HCN emission from mass-losing carbon stars has revealed masers in the J = 3-2 and 4-3 transitions of the (011c0) vibrational bending mode. These lines have not previously been known to show maser action. Five stars - R Scl, V384 Per, R Lep, Y CVn, and V Cyg - out of 12 observed were detected as masers. Allowing for evidence of variability, this detection rate suggests that these HCN lines are masers at least some of the time in the majority of mass-losing carbon stars. The line widths and velocities imply that the maser action occurs in gas close to the star, where the circumstellar envelope is just being accelerated outward.
AB - A survey with the Heinrich Hertz Submillimeter Telescope of HCN emission from mass-losing carbon stars has revealed masers in the J = 3-2 and 4-3 transitions of the (011c0) vibrational bending mode. These lines have not previously been known to show maser action. Five stars - R Scl, V384 Per, R Lep, Y CVn, and V Cyg - out of 12 observed were detected as masers. Allowing for evidence of variability, this detection rate suggests that these HCN lines are masers at least some of the time in the majority of mass-losing carbon stars. The line widths and velocities imply that the maser action occurs in gas close to the star, where the circumstellar envelope is just being accelerated outward.
KW - Masers
KW - Molecular processes
KW - Radio lines: Stars
KW - Stars: Carbon
KW - Stars: Mass loss
UR - http://www.scopus.com/inward/record.url?scp=0039840336&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0039840336&partnerID=8YFLogxK
U2 - 10.1086/319130
DO - 10.1086/319130
M3 - Article
AN - SCOPUS:0039840336
VL - 549
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1 PART 2
ER -