2002A&A...389..494G


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:56:33

2002A&A...389..494G - Astronomy and Astrophysics, volume 389, 494-512 (2002/7-2)

Near-infrared spectra of ISO selected Chamaeleon I young stellar objects.

GOMEZ M. and PERSI P.

Abstract (from CDS):

We present 0.95-2.5µm moderate (R∼500) resolution spectra of 19 ISOCAM detected sources in the Chamaeleon I dark cloud. Thirteen of these stars are candidate very low mass members of the cloud proposed by Persi et al. (2000A&A...357..219P) on basis of the mid-IR color excess. The sample also includes a bona-fide young brown dwarf (Cha Hα 1), a transition - stellar/sub-stellar - object (Cha Hα 2), one previously known T Tauri star (Sz 33) and three ISOCAM sources with no mid-IR excess. The spectra of the mid-IR color excess sources are relatively flat and featureless in this wavelength range. Both atomic and molecular lines (when in absorption) are partially veiled suggesting the presence of continuum emission from circumstellar dust. In addition some of the sources show Paschen and Brackett lines in emission. We apply the 2µm water vapor index defined by Wilking et al. (1999AJ....117..469W) to estimate spectral types. These stars have spectral types M0-8. We use Persi et al.'s stellar luminosity determinations, in combination with D'Antona & Mazzitelli latest pre-main sequence evolutionary tracks, to estimate masses and ages. The ISOCAM detected mid-IR excess sources have sub-solar masses down to the H-burning limit and a median age of few x106yr, in good agreement with the higher mass members of this cloud.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - stars: formation - stars: pre-main sequence - stars: Hertzsprung-Russell (HR) diagram - stars: low-mass, brown dwarfs - infrared: stars

CDS comments: In reflist, Comeron and Rieke, A&A : 1998 is a misprint for 1999 (1999A&A.343.477C).

Simbad objects: 27

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Number of rows : 27

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 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3478 0
2 ISO-ChaI 79 pr* 11 06 39.4494750569 -77 36 05.243613520         17.83 M5e 24 0
3 NAME Cha I MoC 11 06 48 -77 18.0           ~ 968 1
4 [NC98] Cha HA 1 Y*O 11 07 16.6694944374 -77 35 53.222755937   22.8 21.0   16.38 M7.5/8e 82 0
5 [NC98] Cha HA 9 BD* 11 07 18.5742862738 -77 32 51.553842979     23.1   17.57 M5.5e 48 0
6 V* HK Cha Or* 11 07 42.3440888366 -77 33 59.381952754   21.9 19.8   15.26 ~ 76 0
7 ISO-ChaI 138 LM* 11 08 18.4678367177 -77 30 40.889960359         16.77 ~ 36 0
8 ISO-ChaI 143 Y*? 11 08 22.3644100400 -77 30 27.790600663         15.51 M5e 39 0
9 CHSM 13217 * 11 08 43.0326486868 -76 27 46.820869010           ~ 4 0
10 ISO-ChaI 158 * 11 08 51.1122716425 -76 28 21.395989237           ~ 2 0
11 CHX 15b pr* 11 09 40.0554020707 -76 28 39.259268411   15.68 14.04   11.66 K8Ve 33 0
12 2MASS J11094866-7714383 Y*O 11 09 48.67 -77 14 38.3           M1 10 0
13 ISO-ChaI 220 Y*O 11 09 53.3256952909 -77 28 36.636877998           M5.75 26 0
14 V* HX Cha Or* 11 09 54.062760 -76 29 25.54332       16.08 14.03 M3.5+M7 62 0
15 V* HY Cha Or* 11 09 54.3715732403 -76 31 11.425347874     21.6   17.27 M1.75e 26 0
16 2MASS J11100785-7727480 Y*? 11 10 07.8409195036 -77 27 48.070710758         17.79 M5.5 29 0
17 ISO-ChaI 239 * 11 10 12.3258183440 -77 27 09.865291366       17.57 15.70 III 3 0
18 ISO-ChaI 250 LM* 11 10 36.4169296509 -77 22 13.101624548         16.52 M4.75 18 0
19 ISO-ChaI 252 Y*? 11 10 41.3837182099 -77 20 47.962681310     22.4 20.06 17.27 ~ 32 0
20 V* IK Cha Or* 11 10 53.5826928495 -77 25 00.473687651         17.51 M4.5 28 0
21 V* IM Cha Or* 11 12 03.5022968628 -77 26 00.846650924     20.08     M4.75 28 0
22 Sz 84 TT* 15 58 02.5212129160 -37 36 02.733294310   14.3       M5.0e 50 0
23 NAME Lup Cloud SFR 16 03 -38.1           ~ 517 0
24 THA 15-24 Y*O 16 08 21.8039413126 -39 04 21.489571046   16.18 14.61 14.67 12.92 M3 45 0
25 THA 15-31 Em* 16 08 36.9029603891 -40 16 20.384805732   15.0 14     M4 16 0
26 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3027 0
27 ISO-ChaI 238 IR ~ ~           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-21:56:33

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