2016A&A...587A.101R


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST16:39:21

2016A&A...587A.101R - Astronomy and Astrophysics, volume 587A, 101-101 (2016/3-1)

Radial velocity variable, hot post-AGB stars from the MUCHFUSS project. Classification, atmospheric parameters, formation scenarios.

REINDL N., GEIER S., KUPFER T., BLOEMEN S., SCHAFFENROTH V., HEBER U., BARLOW B.N. and OSTENSEN R.H.

Abstract (from CDS):

In the course of the MUCHFUSS project we recently discovered four radial velocity (RV) variable, hot (Teff≃80000-110000K) post-asymptotic giant branch (AGB) stars. Among them, we found the first known RV variable O(He) star, the only second known RV variable PG1159 close binary candidate, as well as the first two naked (i.e., without planetary nebula (PN)) H-rich post-AGB stars of spectral type O(H) that show significant RV variations. We present a non-LTE spectral analysis of these stars along with one further O(H)-type star whose RV variations were found to be not significant. We also report the discovery of a far-infrared excess in the case of the PG1159 star. None of the stars in our sample displays nebular emission lines, which can be explained well in terms of a very late thermal pulse evolution in the case of the PG1159 star. The ``missing'' PNe around the O(H)-type stars seems strange, since we find that several central stars of PNe have much longer post-AGB times. Besides the non-ejection of a PN, the occurrence of a late thermal pulse, or the re-accretion of the PN in the previous post-AGB evolution offer possible explanations for those stars not harbouring a PN (anymore). In the case of the O(He) star J0757, we speculate that it might have been previously part of a compact He transferring binary system. In this scenario, the mass transfer must have stopped after a certain time, leaving behind a low-mass close companion that may be responsible for the extreme RV shift of 107.0 ±22.0km/s that was measured within only 31min.

Abstract Copyright:

Journal keyword(s): binaries: spectroscopic - stars: AGB and post-AGB - stars: evolution - stars: atmospheres

Simbad objects: 28

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Number of rows : 28

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 Ton S 154 HS* 00 21 58.7338342220 -24 25 20.850273968   14.10 14.48     sdO4He2 18 0
2 SH 2-188 PN 01 30 33.1777443823 +58 24 50.324516367   17.424 17.447 17.398 17.376 DAO.6 92 1
3 PN HaWe 5 PN 03 45 26.6815107728 +37 48 52.219399393   17.321 17.439 17.471 17.528 DA1.3 21 1
4 SH 2-216 PN 04 43 21.2636696575 +46 42 05.836016165   12.50 12.87 13.04   DAO.6 150 2
5 PN HDW 4 PN 05 37 56.2345003531 +55 32 15.754158636   16.310 16.540 16.638 16.739 DA1.0 30 1
6 PN PuWe 1 PN 06 19 33.9433415207 +55 36 43.907448608   15.291 15.545 15.662 15.792 DAO.5 78 1
7 SDSS J075732.18+184329.3 WD* 07 57 32.1843198283 +18 43 29.330396679   18.0   18.9   PG1159/O(He) 7 0
8 PN K 1-2 PN 08 57 45.9618160284 -28 57 36.577010750           ~ 109 1
9 SDSS J093521.39+482432.5 HS* 09 35 21.3790103826 +48 24 32.438533770           sdO 6 0
10 SDSS J100019.98-003413.3 HS* 10 00 19.9861905167 -00 34 13.350291890   17.3   17.8   sdO 11 0
11 PN K 1-22 PN 11 26 43.7671247699 -34 22 11.178770560     17.4     ~ 65 0
12 V* GW Vir WD* 12 01 45.9728868858 -03 45 40.627851273   14.87 15.04     DOQZ1 463 0
13 BD+18 2647 HS* 12 41 51.7901702595 +17 31 19.750592670 10.261 11.70 11.63 11.969 12.159 sdOpec 162 1
14 NAME vZ 1128 pA* 13 42 16.7509485961 +28 26 00.615224766   14.77 15.04 15.50   O8p 68 0
15 SDSS J155610.40+254640.3 HS* 15 56 10.4080058843 +25 46 40.256181802           sdOHe 6 0
16 LS IV -12 1 HS* 16 23 43.9894821460 -12 12 33.641936636 10.06 11.14 11.17     sdO 30 0
17 PN A66 39 PN 16 27 33.7200850209 +27 54 33.472758646   15.27 15.60     DAO.70 118 0
18 NGC 6397 162 HS* 17 40 38.4614296064 -53 38 31.346327354   13.06 13.23     sdOp 40 1
19 NGC 6397 GlC 17 40 42.09 -53 40 27.6   7.39 5.17     ~ 1805 1
20 SH 2-68 PN 18 24 58.4294144035 +00 51 36.016896875   16.0 16.5     DAOZ.6 120 1
21 IC 1295 PN 18 54 37.1480527294 -08 49 37.421956548           DAO.56 89 1
22 PN A66 61 PN 19 19 10.2028390183 +46 14 51.974757707   17.05 17.39     DAO.57 49 0
23 PN G076.3+14.1 PN 19 19 30.5041432016 +44 45 42.706751808     15.670     ~ 10 0
24 Hen 1-5 pA* 20 11 56.06832 +20 20 04.4916 11.41 10.66 9.45     G8/K0Iae 488 1
25 SDSS J204623.12-065926.7 HS* 20 46 23.1267513096 -06 59 26.764805108           sdO3He30 5 0
26 PN A66 74 PN 21 16 52.3415118702 +24 08 51.096477079   16.91 17.11     DAO 65 1
27 SDSS J212531.92-010745.8 WD* 21 25 31.9188232383 -01 07 45.919702114   17.23 17.58     DAB+dM:e 20 0
28 SDSS J232757.46+483755.2 HS* 23 27 57.4683930060 +48 37 55.253753393           sdO 5 0

    Equat.    Gal    SGal    Ecl

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2020.08.14-16:39:21

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