1996A&A...314..896L


Query : 1996A&A...314..896L

1996A&A...314..896L - Astronomy and Astrophysics, volume 314, 896-908 (1996/10-3)

Optical and infrared observations of 27 oxygen-rich stars. Modelling of the circumstellar dust shells.

LE SIDANER P. and LE BERTRE T.

Abstract (from CDS):

We present mid-infrared (10-20µm) photometry obtained on 27 variable oxygen-rich late-type stars, at different epochs during the period 1984-1990. The sample includes representative objects of miras with optical counterparts, as well as type II OH/IR sources; there are also at least 2 supergiants. These measurements are merged with near-infrared ones, already reported and obtained quasi-simultaneously, to derive 72 (1-20µm) broad band energy distributions. These results are complemented also with IRAS data and flux measurements obtained in the sub-millimeter range. The resulting spectra are interpreted in terms of a circumstellar dust shell radiative transfer model applied for each object at different phases of their lightcurves. The modelling appears to be consistent for a large variety of oxygen-rich sources with optical depth at 10µm ranging from ∼0.01 to 10. The temperature of formation of the grains is taken to range from 800 to 950K depending on the pressure at the site of dust formation (P∼10–7-10–4dyn.cm–2). Physical parameters such as inner radius of the circumstellar dust shell, bolometric luminosity and mass-loss rate are evaluated. For the objects in the sample, the mass-loss rate ranges from 2x10–8 to 10–4M/yr. In the context of the planned and underway near-infrared surveys we discuss the relations between color indices and optical depth for oxygen-rich sources. Circumstellar shell optical depths and mass-loss rates are shown to be correlated to the [K-12µm] color. Unfortunately, near-infrared data alone seem to be insufficient to determine physical parameters reliably.

Abstract Copyright:

Journal keyword(s): radiative transfer - stars: circumstellar matter - stars: mass loss - stars: AGB and post-AGB - infrared: stars - radio continuum: stars

VizieR on-line data: <Available at CDS (J/A+A/314/896): table1 table1.tex table2a table2a.tex table2b table2b.tex table3>

Simbad objects: 29

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Number of rows : 29
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* SY Scl Mi* 00 07 36.2429880634 -25 29 39.954868429     12.15     M6e 62 0
2 V* BE Phe Mi? 00 21 47.4180506941 -40 17 15.472495948         11.51 M9+ 31 0
3 IRC +10011 OH* 01 06 25.9889735162 +12 35 52.890666456   20.7   18.26 14.01 M8 407 0
4 V* UU For Mi* 02 37 23.0619541730 -26 58 42.300584247   11.64 10.13 12.51 8.45 M9 55 0
5 V* IK Tau Mi* 03 53 28.8884898148 +11 24 21.865959095 16.99 17.03 13.39 7.29 3.20 M7-11 591 0
6 V* S Col Mi* 05 46 56.3071200737 -31 41 28.351121384   11.98 11.01     M8 67 0
7 V* TT Col Mi* 05 49 06.3557074854 -32 20 00.398491965     11.5     M7 17 0
8 V* VY CMa s*r 07 22 58.32877 -25 46 03.2355 12.01 10.19 7.95     M5Iae 1032 0
9 V* V353 Pup LP* 07 46 34.1471255132 -32 18 16.479255102   11.52 9.25     M4 27 0
10 V* IW Hya OH* 09 45 15.2271331857 -22 01 45.289428464     16     M8/9 108 0
11 OH 285.05 +0.07 OH* 10 30 36.4952009425 -57 48 52.857849911           M9+: 21 0
12 V* V425 Car OH* 10 39 55.7319492521 -58 33 19.064223454         14.54 M9 25 0
13 OH 300.93 -0.03 OH* 12 33 55.1848711022 -62 49 56.780603820           M9: 17 0
14 OH 305.9 -1.9 OH* 13 19 05.2057880719 -64 37 30.438028490           ~ 14 0
15 OH 315.22 +0.01 OH* 14 33 30.5864345574 -60 23 31.579836586     13.80     ~ 19 0
16 OH 341.12 -0.00 OH* 16 51 02.04408 -44 23 29.9040           ~ 13 1
17 OH 342.01 +0.25 LP* 16 53 04.8813217991 -43 32 47.320605517           ~ 21 0
18 OH 346.86 -0.18 OH* 17 10 52.4294965064 -39 58 49.856997156         13.71 ~ 15 0
19 OH 344.83 -1.67 OH* 17 10 53.6591818927 -42 28 59.702804001           ~ 15 0
20 OH 353.60 -0.23 OH* 17 30 27.55872 -34 27 44.5536           ~ 22 0
21 OH 354.88 -0.54 OH* 17 35 02.72136 -33 33 29.4120           O-rich 66 1
22 RAFGL 1992 OH* 17 39 14.93424 -30 14 24.3204           O-rich 51 1
23 OH 2.6 -0.4 OH* 17 53 18.84768 -26 56 37.4064           M8-9 71 0
24 OH 26.5 +0.6 OH* 18 37 32.50920 -05 23 59.1936           O-rich 286 0
25 IRC -20540 OH* 19 08 54.9265603412 -22 14 18.578913052     17 14.58 10.55 M8: 76 0
26 IRC -10529 OH* 20 10 27.8733409252 -06 16 13.757843352         15.49 M: 135 0
27 V* CD Gru Mi? 22 26 10.7033687377 -45 14 11.824133432           M8 27 0
28 V* KZ Peg Mi* 22 54 11.4035845391 +08 54 07.371571362           M7 70 1
29 V* R Aqr Sy* 23 43 49.4629939776 -15 17 04.184232557   8.823 7.683 9.37   M6.5-8.5e 754 0

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2021.09.21-07:18:13

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