2003A&A...407..213V


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.11CEST07:22:26

2003A&A...407..213V - Astronomy and Astrophysics, volume 407, 213-224 (2003/8-3)

VLBI astrometry of circumstellar OH masers: Proper motions and parallaxes of four AGB stars.

VLEMMINGS W.H.T., VAN LANGEVELDE H.J., DIAMOND P.J., HABING H.J. and SCHILIZZI R.T.

Abstract (from CDS):

The main-line OH masers around 4 AGB stars have been observed with the NRAO Very Long Baseline Array (VLBA) at 8 epochs over a period of 2.5yrs. Using a phase referencing technique, the position of the most compact maser spot of each star was monitored with respect to two extragalactic reference sources. For U Her and W Hya, we observe the most blue-shifted maser spot, while for R Cas and S CrB we only detect a compact red-shifted maser spot. We managed to determine an accurate proper motion and parallax for U Her, R Cas and S CrB, while additional motion of the compact blue-shifted maser of W Hya is shown to possibly be related to the stellar pulsation. The motion and radio position are compared with the stellar trajectory and absolute optical position determined by the Hipparcos satellite. For U Her and W Hya, the most blue-shifted maser is consistent with the amplified stellar image. The new distances are compared with several published P-L relations, and in this respect the VLBI distances seem an improvement upon the Hipparcos distances.

Abstract Copyright:

Journal keyword(s): masers - stars: circumstellar matter - stars: AGB and post-AGB - techniques: interferometric - astrometry

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* R Crt AB* 11 00 33.8541158313 -18 19 29.574953304   10.33 9.80     M7/8III 202 0
2 V* RT Vir AB* 13 02 37.9836301550 +05 11 08.360733054 10.07 9.07 7.41     M8III 302 0
3 QSO B1336-260 QSO 13 39 19.89075991 -26 20 30.4955578   20.5   20.50   ~ 35 1
4 QSO B1339-287 QSO 13 42 15.34561635 -29 00 41.8315406     19.5 19.2   ~ 34 1
5 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 612 0
6 V* RS Vir Mi* 14 27 16.3931666073 +04 40 41.085779853   10.27 7.00     M8 201 0
7 V* S CrB Mi* 15 21 23.9560807971 +31 22 02.567988144 7.51 7.15 5.80     M6.5-8e 337 0
8 7C 1520+3154 QSO 15 22 09.99172973 +31 44 14.3819060   20.45 19.89 19.87   ~ 144 1
9 7C 1525+3125 QSO 15 27 18.7371024974 +31 15 24.384315817   19.67 19.30 18.6   ~ 53 1
10 V* U Her Mi* 16 25 47.4723609675 +18 53 32.862370166 8.85 8.23 6.70     M6.5-8+e 522 1
11 NVSS J163011+213134 Rad 16 30 11.2305658 +21 31 34.308455           ~ 17 1
12 [VV2006] J163638.1+211255 QSO 16 36 38.1834210744 +21 12 55.592412414   19.86 19.69 18.70   ~ 52 1
13 V* R Aql OH* 19 06 22.2510506325 +08 13 48.000441251 8.06 7.69 6.09     M6.5-9e 544 0

    Equat.    Gal    SGal    Ecl

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2021.04.11-07:22:26

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