2009A&A...497..973V


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.03CEST22:48:21

2009A&A...497..973V - Astronomy and Astrophysics, volume 497, 973-981 (2009/4-3)

An IPHAS-based search for accreting very low-mass objects using VO tools.

VALDIVIELSO L., MARTIN E.L., BOUY H., SOLANO E., DREW J.E., GREIMEL R., GUTIERREZ R., UNRUH Y.C. and VINK J.S.

Abstract (from CDS):

The main goal of this paper is to prove that accreting very low-mass stars and brown dwarfs can be identified in IPHAS, an Hα emission survey of the northern Milky Way. Full exploitation of the IPHAS database and a future extension of it in the southern hemisphere will be useful in identifying very low-mass accreting objects near to and far from well-known star-forming regions. We have used Virtual Observatory tools to cross-match the IPHAS catalogue with the 2MASS catalogue. We defined photometric criteria to identify Hα emission sources with near-infrared colours similar to those of known young very low-mass stars and brown dwarfs. 4000 candidates were identified that met our criteria over an area of 1600 square degrees. We present low-resolution optical spectra of 113 candidates. Spectral types have been derived for the 33 candidates that have spectroscopically confirmed Hα emission, negligible reddening and spectral class M. We have also measured Hα emission and investigated the NaI doublet (818.3nm, 819.5nm) in these 33 objects. We confirm that 33 IPHAS candidates have strong Hα emission indicative of disc accretion for their spectral type. Twenty-three of them have spectral class M4 or later, of which ten have classes in the range M5.5-M7.0 and could thus be very young brown dwarfs. Many objects also have a weak NaI doublet, an indication of low surface gravity. IPHAS provides a very valuable database for identifying accreting very low-mass stars and brown dwarfs. Virtual Observatory tools provide an efficient method for identifying these objects over large areas of the sky. Based on our success rate of 23 Hα emission objects with spectral type in the range M4-M7 out of 113 candidates with spectroscopic follow-up, we estimate that there could be hundreds of such objects in the full IPHAS survey.

Abstract Copyright:

Journal keyword(s): stars: low-mass, brown dwarfs - stars: formation - stars: planetary systems: protoplanetary disks - stars: pre-main sequence - infrared: stars

Simbad objects: 56

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Number of rows : 56

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 2MASS J00020151-0106364 LM* 00 02 01.5150916201 -01 06 36.524399057           M3V 3 0
2 2MASS J00164954+6542418 * 00 16 49.5478563463 +65 42 41.895524145           M5.5 1 0
3 2MASS J00165589+6547327 * 00 16 55.8807884736 +65 47 32.735990894           M6 1 0
4 SDSS J002328.15+001709.0 LM* 00 23 28.1432818091 +00 17 09.212023513           M4V 3 0
5 2MASS J00483011-0030294 LM* 00 48 30.1046754748 -00 30 28.924370321           M3V 3 0
6 2MASS J01111401-0031283 * 01 11 13.9705769538 -00 31 28.400043711           M3V 2 0
7 2MASS J01144300+6208210 * 01 14 42.9986727546 +62 08 21.037787667           M4.5 1 0
8 2MASS J01234867+6149320 * 01 23 48.6910640197 +61 49 31.993432663           M4 1 0
9 2MASS J01371999+6459578 * 01 37 20.0142595665 +64 59 57.612516289           M4 1 0
10 2MASS J02361596+6156096 Y*O 02 36 15.97 +61 56 09.6           M2.5 2 0
11 2MASS J02495833-0034099 LM* 02 49 58.3449530907 -00 34 09.984477843           M9V 6 0
12 IC 348 OpC 03 44 34 +32 09.8           ~ 1230 1
13 2MASS J03544917+5309033 * 03 54 49.1799782817 +53 09 03.284184848           M3 1 0
14 IPHAS J035823.95+522312.6 Em* 03 58 23.9578912540 +52 23 12.560491752           M1.5 2 0
15 2MASS J04245068+4553302 * 04 24 50.6666336334 +45 53 30.234315082           M3.5 1 0
16 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3495 0
17 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 235 0
18 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1471 1
19 [BZR99] S Ori 55 LM* 05 37 25.88208 -02 34 32.0736         21.07 M9Ve 21 0
20 NAME Ori I As* 05 38 -02.8           ~ 559 0
21 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 487 0
22 UGCS J053900.29-023705.7 Y*? 05 39 00.29712 -02 37 05.7648           M8 22 0
23 SDSS J100218.61-000408.5 PM* 10 02 18.6144252445 -00 04 08.481768770           M7V 3 0
24 NAME Cha I MoC 11 06 48 -77 18.0           ~ 972 1
25 2MASS J11392207+0000486 LM* 11 39 22.0749100298 +00 00 48.795986506           M5 3 0
26 NAME Cha II MoC 12 54 -77.2           ~ 296 0
27 2MASS J12535097-0010103 LM* 12 53 50.98 -00 10 10.3           M1V 6 0
28 SDSS J135859.02-005357.5 LM* 13 58 59.0056034370 -00 53 57.610123206           M9V 3 0
29 SDSS J150026.34-003927.9 LM* 15 00 26.3249117975 -00 39 28.004547938       15.9 13.8 M7V 15 0
30 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3035 0
31 2MASS J18303414+0038005 Y*? 18 30 34.1509022105 +00 38 00.540726120           M6.5 2 0
32 2MASS J18375325+0018491 Y*? 18 37 53.2491152661 +00 18 49.109242972           M6 2 0
33 UCAC2 39367140 * 19 26 56.0441071607 +21 14 38.048374754       15.98   M0 1 0
34 HD 227900 * 20 08 24.1415999720 +41 15 03.920107895 10.14 10.75 10.62     B2III 65 0
35 2MASS J20205040+3942435 * 20 20 50.4004039218 +39 42 43.557917005           M2 1 0
36 NOMAD1 1323-0477153 Em* 20 24 34.3065253029 +42 21 26.510202160   19.880   18.500   M5.5 3 0
37 2MASS J20243725+3858068 * 20 24 37.2894306760 +38 58 06.779151430           M5 1 0
38 2MASS J20245553+4245039 * 20 24 55.5331300555 +42 45 04.079681672           M5 1 0
39 2MASS J20275982+3904182 * 20 27 59.8198823649 +39 04 18.080304591           M3.5 1 0
40 2MASS J20421854+3957238 * 20 42 18.5474401185 +39 57 23.806401020           M2 1 0
41 2MASS J20435067+4001088 * 20 43 50.6751757771 +40 01 08.851049558           M1.5 1 0
42 2MASS J20470481+4349114 Y*? 20 47 04.8191272796 +43 49 11.459375747           M2 2 0
43 2MASS J20561307+4434240 Y*? 20 56 13.0859597535 +44 34 24.164415586     21.17     M6 5 0
44 2MASS J20570162+4341387 * 20 57 01.6316750280 +43 41 38.847344325   20.956 19.735   16.156 M7 3 0
45 2MASS J20570268+4341436 * 20 57 02.6888397608 +43 41 43.718691855           M5.5 1 0
46 IPHAS J210404.87+535124.4 TT* 21 04 04.8668245374 +53 51 24.389163937           M6 3 0
47 [BVD2011] 18 Em* 21 35 28.4174074368 +57 58 23.116998550           M4 3 0
48 [BVD2011] 22 Em* 21 35 45.869 +57 36 40.11           M4 4 0
49 [BVD2011] 84 Em* 21 39 38.8348456953 +57 54 51.314863350           M4.5 2 0
50 [BVD2011] 146 Em* 21 45 47.7374467874 +56 48 45.744804774           M5 2 0
51 [OSP2002] BRC 39 4 Em* 21 46 25.9787975569 +57 28 28.772682157           M2.5 7 0
52 2MASS J22202522+6054235 * 22 20 25.2234597855 +60 54 23.569249347           M4 1 0
53 2MASS J22483076+6114179 * 22 48 30.7672035554 +61 14 17.937002601           M5 1 0
54 2MASS J22533130+6235432 Y*O 22 53 31.3187471534 +62 35 43.256736571     21.96   18.17 M6 2 0
55 2MASS J22592371+6141384 * 22 59 23.7004713926 +61 41 38.561239643           M5 1 0
56 Ass Ori OB 1a As* ~ ~           ~ 195 0

    Equat.    Gal    SGal    Ecl

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2020.08.03-22:48:21

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