2002A&A...386..899S


Query : 2002A&A...386..899S

2002A&A...386..899S - Astronomy and Astrophysics, volume 386, 899-909 (2002/5-2)

Low resolution spectroscopy of ISOGAL sources: Search for early-type stars with infrared excess.

SCHULTHEIS M., PARTHASARATHY M., OMONT A., COHEN M., GANESH S., SEVRE F. and SIMON G.

Abstract (from CDS):

An analysis of low resolution spectra and infrared data of 29 ISOGAL-DENIS sources with mid-IR excess is presented. Eight ISOGAL sources from our sample with 7-15µm excesses are found to be B and A-type stars, some of them with emission lines. Two ISOGAL sources, J175614.4-240831 (B3-4IIIe) and J173845.3-312403 (B7IIIe), show a bump between 5000 and 6000Å which may be attributed to extended red emission (ERE). Some of the B, A and F-type giants with a large infrared excess might be in the post-AGB phase. For about 50% of the sources in this preliminary study, a nearby second (or even multiple) component was found. Such sources, in particular two B-stars, are not discussed when the probability of the optical spectrum being associated with the ISOGAL source is low. These results confirm that the DENIS-ISOGAL I-J/K-[15] diagram is the most suitable diagram to distinguish between early (AB) and late spectral types (KM). It provides the most useful tool to systematically search for nearby early-type stars with an infrared excess among the background of distant AGB stars in ISOGAL fields of the Galactic disk.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: early-type - Galaxy: solar neighbourhood - ISM: reflection nebulae - ISM: dust, extinction

Simbad objects: 37

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Number of rows : 37
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 611 1
2 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 745 0
3 THA 35-II-27 PN 10 19 32.501 -60 13 29.48     12.5     B:Ie 88 0
4 BD-07 3632 WD* 13 30 13.6370112733 -08 34 29.468140653 11.803 12.398 12.340 12.39 12.436 DA3.5 180 0
5 ISOGAL-P J143131.9-600646 RG* 14 31 31.8707297064 -60 06 47.319835968         13.97 ~ 2 0
6 ISOGAL-P J143313.2-603705 MIR 14 33 13.2 -66 10 05           ~ 1 0
7 ISOGAL-P J164825.8-441403 NIR 16 48 25.72 -44 14 03.2           ~ 1 0
8 ISOGAL-P J165019.1-435927 NIR 16 50 19.0981857504 -43 59 27.021815196           ~ 1 0
9 ISOGAL-P J165102.4-443738 MIR 16 51 02.4 -44 37 38           ~ 1 0
10 ISOGAL-P J172001.7-371024 MIR 17 20 01.7 -38 40 24           ~ 1 0
11 ISOGAL-P J172807.6-331812 NIR 17 28 07.6464201360 -33 18 12.481272216           ~ 1 0
12 ISOGAL-P J172823.5-351559 NIR 17 28 23.5202911032 -35 15 59.326734492           ~ 1 0
13 ISOGAL-P J172830.3-332214 * 17 28 30.3408514920 -33 22 14.789044704           ~ 1 0
14 ISOGAL-P J173219.1-334751 Y*? 17 32 19.0998766824 -33 47 51.758330136           ~ 2 0
15 ISOGAL-P J173221.5-335405 NIR 17 32 21.5232445944 -33 54 05.203915344           ~ 1 0
16 ISOGAL-P J173223.0-320841 * 17 32 23.1440306904 -32 08 41.830121328           ~ 1 0
17 ISOGAL-P J173537.4-335753 Y*? 17 35 37.4478357840 -33 57 52.562891376           ~ 2 0
18 WRAY 15-1741 Em* 17 37 12.5392694592 -31 18 51.977178576     12.00     ~ 2 0
19 ISOGAL-P J173745.0-311531 * 17 37 44.9618961264 -31 15 30.937504500           ~ 1 0
20 TYC 7376-394-1 * 17 38 45.2551092888 -31 24 03.149098524   13.08 11.90     ~ 2 0
21 ISOGAL-P J174634.7-282008 * 17 46 34.7107565616 -28 20 07.986170328           ~ 1 0
22 ISOGAL-P J174647.0-283542 * 17 46 46.9856461056 -28 35 42.234934416           ~ 1 0
23 ISOGAL-P J174650.3-284451 * 17 46 50.2663870512 -28 44 50.510694156           ~ 1 0
24 [RHI84] 10-613 * 17 47 16.9807256784 -29 01 44.124690180     14.80     M4 2 0
25 ISOGAL-P J174735.9-274633 NIR 17 47 35.8251853032 -27 46 32.946441888           ~ 1 0
26 ISOGAL-P J174803.0-282019 * 17 48 02.9886174096 -28 20 19.137831360           ~ 1 0
27 ISOGAL-P J174804.2-281028 NIR 17 48 04.1251274088 -28 10 27.867818928           ~ 1 0
28 [RHI84] 10-665 * 17 48 12.1042981416 -28 23 18.340030644     14.60     M2: 2 0
29 ISOGAL-P J174819.8-280513 * 17 48 19.8473366424 -28 05 13.139377656           ~ 1 0
30 IRAS 17485-2627 mul 17 51 41.9 -26 27 49           ~ 4 0
31 ISOGAL-P J175142.0-262754 Y*? 17 51 41.9356410192 -26 27 54.171849024       15.99   ~ 2 0
32 2MASS J17561436-2408313 Em* 17 56 14.3671838784 -24 08 31.350566832           ~ 2 0
33 ATO J270.8681-22.3830 WR* 18 03 28.3638482328 -22 22 58.994794668   17.39 15.60 14.72   WN8-9 3 0
34 V* V1545 Sgr Mi* 18 04 46.2160229736 -30 03 18.724848192     17.300   12.33 M7III 8 0
35 V* V1547 Sgr Mi* 18 04 48.3059906256 -30 04 00.929960616     18.832   12.44 ~ 9 0
36 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 682 0
37 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 612 1

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2023.02.01-06:11:07

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