2004ApJS..155..595D


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.24CET13:23:30

2004ApJS..155..595D - Astrophys. J., Suppl. Ser., 155, 595-622 (2004/December-0)

OH maser observations of likely planetary nebulae precursors.

DEACON R.M., CHAPMAN J.M. and GREEN A.J.

Abstract (from CDS):

We present OH maser observations at 1612, 1665, 1667, and 1720 MHz for 86 likely post-asymptotic giant branch (post-AGB) stars selected from a survey of 1612 MHz maser sources in the Galactic plane. The observations were taken with the Parkes Telescope and the Australia Telescope Compact Array between 2002 September and 2003 August. Post-AGB stars are the precursors to planetary nebulae, the diverse morphological range of which is unexplained. The maser observations were taken to investigate the onset and incidence of stellar wind asymmetries during the post-AGB phase. We redetected all 86 sources at 1612 MHz, while 27 sources were detected at 1665 MHz and 45 at 1667 MHz. One source was redetected at 1720 MHz. We present a classification scheme for the maser profiles and show that 25% of sources in our sample are likely to have asymmetric or bipolar outflows. From a comparison of the maser and far-infrared properties we find that there is a likely evolutionary trend in the shape of the maser profiles with some sources evolving from double-peaked to irregular to fully bipolar profiles. A subset of higher mass sources stand out as having almost no mainline emission and generally double-peaked profiles. At least 30% of sources in the sample have variable peak flux intensities at one or more of the frequencies observed. We also confirm a previously noted 1667 MHz overshoot phenomenon.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - Masers - Radio Lines: Stars - Stars: AGB and Post-AGB - Stars: Evolution - Stars: Mass Loss

VizieR on-line data: <Available at CDS (J/ApJS/155/595): table1.dat table3.dat>

Simbad objects: 24

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Number of rows : 24

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IRAS 14341-6211 pA* 14 38 04.98 -62 24 47.6           ~ 18 0
2 MMB G323.459-00.079 Mas 15 29 19.33 -56 31 22.8           ~ 24 0
3 OH 326.932 +2.754 OH* 15 37 31.8000800376 -52 12 14.104944229           ~ 3 0
4 OH 326.530 -0.419 Mas 15 48 19.498 -54 58 21.52           ~ 5 0
5 OH 326.5 -0.6 pA* 15 49 11.3361694808 -55 08 51.838137874           ~ 28 0
6 OH 328.4 -0.2 OH* 15 57 23.190 -53 37 32.66           ~ 16 1
7 IRAS 15544-5332 pA? 15 58 18.830 -53 40 39.84           ~ 13 0
8 OH 335.832 +1.434 OH* 16 24 33.9530166923 -47 21 30.182390974           ~ 11 0
9 RAFGL 6815S pA* 17 18 19.8316623567 -32 27 21.376880888           G2I 144 0
10 IRAS 17164-3226 PN 17 19 40.8218640149 -32 29 52.712109403         16.38 ~ 17 0
11 IRAS 17188-3838 Y*? 17 22 18.78 -38 41 39.3           ~ 8 0
12 OH 351.60 +0.32 OH* 17 22 42.66264 -35 49 31.5588           ~ 9 0
13 IRAS 17227-3623 OH* 17 26 07.29024 -36 26 14.2188           ~ 6 0
14 IRAS 17256-3258 OH* 17 28 55.77120 -33 00 42.7644           ~ 7 0
15 OH 355.03 +0.17 * 17 32 39.14064 -33 04 15.1860           ~ 11 0
16 OH 359.1 +1.2 OH* 17 39 07.6961706241 -29 04 02.951143280           ~ 21 0
17 IRAS 17392-3020 OH* 17 42 30.53664 -30 22 07.3668           ~ 11 0
18 IRAS 17414-3108 OH* 17 44 39.77352 -31 10 05.0376           ~ 7 0
19 OH 1.5 -0.1 OH* 17 49 20.93232 -27 41 54.5460           ~ 12 0
20 SCHB 246 Mas 17 57 33.587 -31 03 02.08           ~ 2 0
21 OH 9.097 -0.392 OH* 18 07 20.861 -21 16 10.86           ~ 32 0
22 OH 10.0 -0.1 OH* 18 08 16.384 -20 16 11.56           ~ 30 0
23 OH 7.420 -2.042 OH* 18 10 04.804 -23 32 09.83           ~ 2 0
24 Caswell OH 043.165-00.028 Mas 19 10 21.68 +09 05 04.0           ~ 4 0

    Equat.    Gal    SGal    Ecl

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2020.02.24-13:23:30

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