2002A&A...385L...1S

Query : 2002A&A...385L...1S

2002A&A...385L...1S - Astronomy and Astrophysics, volume 385L1-4 (2002/4-1)

Submilliarcsecond-resolution mapping of the 43 GHz SiO maser emission in the bipolar post-AGB nebula OH 231.8+4.2.

SANCHEZ CONTRERAS C., DESMURS J.F., BUJARRABAL V., ALCOLEA J. and COLOMER F.

Abstract (from CDS):

We present ∼0.3milliarcsec-resolution maps of the SiO (v=2, J=1-0) maser emission in the bipolar post-AGB nebula OH 231.8+4.2 obtained with the Very Long Baseline Array. These observations have provided for the first time the structure and kinematics of the close stellar environment in a proto-Planetary Nebula. Our observations reveal the SiO maser emission arising in several bright spots of less than ∼10¹³cm in size forming a structure elongated in the direction perpendicular to the symmetry axis of the nebula. Such a distribution is consistent with an equatorial torus with a radius of ∼6AU around the central star. A complex velocity gradient is found along the torus, which suggests rotation and infall of material towards the star. The rotation and infalling velocities deduced are of the same order and range between ∼7 and ∼10 km.s^–1. From our data, we estimate the mass of the SiO torus and the central star, as well as a stringent upper limit to the present stellar mass-loss rate.

Abstract Copyright: ∼

Journal keyword(s): masers - stars: AGB and post-AGB - stars: mass-loss - circumstellar matter - stars: individual: OH 231.8+4.2 - stars: variables: general

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	OH 231.8+04.2	OH*	07 42 16.947	-14 42 50.20						M10III+A	548	0

Query : 2002A&A...385L...1S

Basic data :

OH 231.8+04.2 -- OH/IR Star
Other object types:	`OH* ()`, `Mas (OH,[PCC93],...)`, `MIR (AKARI,MSX5C,...)`, `IR (GLMP,IRAS,...)`, `Mi* (2003AstL)`, `smm (JCMTSE,JCMTSF)`, `V* (V)`, ` ([LFO93])`
ICRS coord. (ep=J2000) :	`07 42 16.947 -14 42 50.20 (Middle-IR) [ 1000 1000 90 ] D 2012yCat.2311....0C`
FK4 coord. (ep=B1950 eq=1950) :	`07 39 59.010 -14 35 42.17 [ 1000 1000 90 ]`
Gal coord. (ep=J2000) :	`231.835226 +04.220231 [ 1000 1000 90 ]`
Spectral type:	`M10III+A C` `2004ApJ...616..519S`

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`OH 0739-14`	`JCMTSF J074216.8-144250`	`OH 231.84+04.22`	`WISE J074216.94-144250.2`
`AKARI-IRC-V1 J0742170-144248`	`MSX5C G231.8348+04.2193`	`OH 231.87+04.2`	`[LFO93] 0739-14`
`AKARI-FIS-V1 J0742166-144247`	`NAME OH 231.8`	`RAFGL 5237`	`[PCC93] 123`
`GLMP 191`	`NAME Calabash Nebula`	*`V QX Pup`**	`[TVH89] 22`
`IRAS 07399-1435`	`NAME Rotten Egg Nebula`	`WB89 1045`	`[WWW74] G231.8+4.2`
`JCMTSE J074216.8-144250`	`OH 231.8+04.2`	`WISEA J074216.93-144249.7`

References (548 between 1850 and 2026) (Total 548)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Data at NED - NASA/IPAC Extragalactic Database : OH 231.8+04.2

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`AKARI-IRC-V1 J0742170-144248`	`AKARI-FIS-V1 J0742166-144247`	`GLMP 191`	`IRAS 07399-1435`	`MSX5C G231.8348+04.2193`
`RAFGL 5237`	*`V QX Pup`**	`WISEA J074216.93-144249.7`	`WISE J074216.94-144250.2`

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