2010A&A...514L...1S


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.26CET01:32:43

2010A&A...514L...1S - Astronomy and Astrophysics, volume 514, L1-1 (2010/5-1)

When an old star smolders. On the detection of hydrocarbon emission from S-type AGB stars.

SMOLDERS K., ACKE B., VERHOELST T., BLOMMAERT J.A.D.L., DECIN L., HONY S., SLOAN G.C., NEYSKENS P., VAN ECK S., ZIJLSTRA A.A. and VAN WINCKEL H.

Abstract (from CDS):

Polycyclic aromatic hydrocarbons (PAHs) produce characteristic infrared emission bands that have been observed in a wide range of astrophysical environments, where carbonaceous material is subjected to ultraviolet (UV) radiation. Although PAHs are expected to form in carbon-rich AGB stars, they have up to now only been observed in binary systems where a hot companion provides a hard radiation field. In this letter, we present low-resolution infrared spectra of four S-type AGB stars, selected from a sample of 90 S-type AGB stars observed with the infrared spectrograph aboard the Spitzer satellite. The spectra of these four stars show the typical infrared features of PAH molecules. We confirm the correlation between the temperature of the central star and the centroid wavelength of the 7.9µm feature, present in a wide variety of stars spanning a temperature range from 3000 to 12000K. Three of four sources presented in this paper extend this relation towards lower temperatures. We argue that the mixture of hydrocarbons we see in these S-stars has a rich aliphatic component. The fourth star, BZ CMa, deviates from this correlation. Based on the similarity with the evolved binary TU Tau, we predict that BZ CMa has a hot companion as well.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: mass-loss - stars: winds, outflows, ISM: molecules

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 LZK 12 Y*O 03 29 10.4138336046 +31 21 59.070333199   16.06 14.25     B5:V+F2: 128 0
2 V* SU Aur Or* 04 55 59.3861369488 +30 34 01.499800471   10.33 9.30 9.17   G2IIIne 544 0
3 V* TU Tau C* 05 45 13.7250342271 +24 25 12.445885507 12.69 11.33 8.46     C-N4+ 110 0
4 CSS 173 S* 05 56 16.0136762299 -08 03 44.964404186           Sr 6 0
5 V* KR Cam S* 06 04 01.9977564625 +59 32 18.961519951           S! 8 0
6 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 723 0
7 V* CF Gem S* 06 27 15.3397571462 +18 04 23.619838923           S 13 0
8 V* BZ CMa S* 06 56 45.4000163263 -25 53 42.104432356     13.00     S 12 0
9 HD 233517 * 08 22 46.7144627395 +53 04 49.232441095   10.85 9.71     K2 83 0
10 WRAY 18-235 S* 11 33 29.7071290976 -68 03 49.959563621   16.039 13.463     S 9 0
11 HD 100764 Pe* 11 35 42.7476806995 -14 35 36.663269333   9.81 8.79 8.08 7.65 C-H2.5 99 0
12 CPD-36 6759 Y*O 15 15 48.4459023859 -37 09 16.026315179   9.21 8.708     F8V 372 1
13 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 836 1

    Equat.    Gal    SGal    Ecl

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2021.01.26-01:32:43

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