2017ApJ...846...96H


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.14CET00:22:04

2017ApJ...846...96H - Astrophys. J., 846, 96-96 (2017/September-2)

Where are the binaries? Results of a long-term search for radial velocity binaries in proto-planetary nebulae.

HRIVNAK B.J., VAN DE STEENE G., VAN WINCKEL H., SPERAUSKAS J., BOHLENDER D. and LU W.

Abstract (from CDS):

We present the results of an expanded, long-term radial velocity search (25 years) for evidence of binarity in a sample of seven bright proto-planetary nebulae (PPNe). The goal is to investigate the widely held view that the bipolar or point-symmetric shapes of planetary nebulae (PNe) and PPNe are due to binary interactions. Observations from three observatories were combined from 2007 to 2015 to search for variations on the order of a few years and then combined with earlier observations from 1991 to 1995 to search for variations on the order of decades. All seven show velocity variations due to periodic pulsation in the range of 35-135 days. However, in only one PPN, IRAS 22272+5435, did we find even marginal evidence for multi-year variations that might be due to a binary companion. This object shows marginally significant evidence of a two-year period of low semi-amplitude, which could be due to a low-mass companion, and it also displays some evidence of a much longer period of >30 years. The absence of evidence in the other six objects for long-period radial velocity variations due to a binary companion sets significant constraints on the properties of any undetected binary companions: they must be of low mass, <=0.2 M, or long period, >30 years. Thus the present observations do not provide direct support for the binary hypothesis to explain the shapes of PNe and PPNe and severely constrains the properties of any such undetected companions.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: general - binaries: spectroscopic - planetary nebulae: general - stars: AGB and post-AGB - stars: AGB and post-AGB

Simbad objects: 9

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Number of rows : 9

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 NGC 1514 PN 04 09 16.9857297577 +30 46 33.469936956   10.01 9.48     sdO+A0/3III 312 2
2 HD 56126 pA* 07 16 10.2589670319 +09 59 47.953674864   9.20 8.32     F0/5Ia 301 0
3 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1743 0
4 HD 161796 pA* 17 44 55.4696 +50 02 39.484 8.00 7.68 7.21 6.77 6.51 F3Ib 310 0
5 HD 335675 pA* 18 11 30.6604895815 +27 05 15.662372766   11.52 10.55     F3Ib 106 0
6 HD 331319 pA* 19 49 29.5621075420 +31 27 16.247184491 10.4 10.196 9.52     F3Ibe 85 0
7 HD 187885 pA* 19 52 52.7031438648 -17 01 50.293465852   9.25 8.68 8.32   F2/6Ia 170 0
8 V* V448 Lac pA* 22 24 31.4284207830 +43 43 10.975183855 11.22 10.61 9.69     F7I 101 0
9 HD 235858 pA* 22 29 10.3755939027 +54 51 06.341145584   11.40 9.52 8.47 7.34 G5Ia 234 0

    Equat.    Gal    SGal    Ecl

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2019.12.14-00:22:04

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