2007ApJ...669L..33C

Query : 2007ApJ...669L..33C

2007ApJ...669L..33C - Astrophys. J., 669, L33-L36 (2007/November-1)

Discovery of gas accretion onto stars in 13 Myr old h and χ Persei.

CURRIE T., KENYON S.J., BALOG Z., BRAGG A. and TOKARZ S.

Abstract (from CDS):

We report the discovery of accretion disks associated with ∼13 Myr old intermediate/low-mass stars in h and χ Persei. Optical spectroscopy of ∼5000 stars in these clusters and a surrounding halo population reveal 32 A-K stars with Hα emission. Matching these stars with 2MASS and optical photometry yields 25 stars with the highest probability of cluster membership and EW(Hα) ≥ 5 Å. Sixteen of these sources have EW(Hα) ≥ 10 Å. The population of accreting sources is strongly spectral type dependent: Hα emission characteristic of accretion, especially strong accretion [EW(Hα) ≥ 10 Å], is much more prevalent around stars later than G0. Strong Hα emission from accretion is typically associated with redder Ks-[8] colors. The existence of accreting pre-main-sequence stars in h and χ Persei implies that circumstellar gas in some systems, especially those with primaries later than G5 spectral type, can last longer than 10-15 Myr.

Abstract Copyright: ∼

Journal keyword(s): Accretion, Accretion Disks - Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 869 - Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 884 - Stars: Planetary Systems: Protoplanetary Disks

VizieR on-line data: <Available at CDS (J/ApJ/669/L33): table1.dat>

Nomenclature: Table 1: [CKB2007] JHHMMSS.ss+DDMMSS.s N=30.

Simbad objects: 41

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Number of rows : 41
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 2MASS J02170730+5711129 * 02 17 07.3131652008 +57 11 12.800692068     17.239   15.8128 G4.1V 3 0
2 LAWD 12 WD* 02 17 33.5265164448 +57 06 47.350663920 12.64 13.56   14.6   DA2.3 59 0
3 ZTF J021736.98+570110.5 RS* 02 17 36.9822562728 +57 01 10.509238380     16.660   15.3593 G0.5V 7 0
4 2MASS J02173869+5726460 * 02 17 38.6871582648 +57 26 46.150768644           K4 1 0
5 2MASS J02174848+5723319 * 02 17 48.4801209840 +57 23 31.854700788     18.2689   16.551 K1.6V 3 0
6 ZTF J021755.15+565602.9 RS* 02 17 55.1520682512 +56 56 02.892343092     17.034   15.545 G2.7V 5 0
7 2MASS J02180536+5701282 * 02 18 05.3721394200 +57 01 28.238397204     17.336   15.902 G2.5V 3 0
8 ZTF J021805.75+571858.2 EB* 02 18 05.7538240752 +57 18 58.199895468     17.6641   16.0371 G1.6V 7 0
9 2MASS J02181172+5704429 * 02 18 11.7327896016 +57 04 42.987978156     20.313   18.024 K7.4V 3 0
10 2MASS J02183648+5701151 * 02 18 36.4808470944 +57 01 15.069256680     18.339   16.688 G6.0V 3 0
11 NGC 869 775 * 02 18 39.8819221584 +57 10 14.113158636   16.170 15.502   14.7330 A5.0V 11 0
12 NGC 869 OpC 02 18 57.0 +57 08 02           ~ 504 0
13 2MASS J02190670+5652178 * 02 19 06.7039437240 +56 52 17.865242256     18.067   16.455 K0.6V 3 0
14 2MASS J02201431+5644216 * 02 20 14.3398818504 +56 44 21.554111004           G1 1 0
15 ZTF J022036.75+570536.7 RS* 02 20 36.7504588296 +57 05 36.665022300     17.3849   15.8669 G2.4V 7 0
16 2MASS J02205237+5713046 Em* 02 20 52.3773571944 +57 13 04.635596280     17.5878   15.9283 G6.0V 5 0
17 2MASS J02211562+5704378 * 02 21 15.6293753352 +57 04 37.867534248     18.6370   16.793 K2.5V 3 0
18 2MASS J02213259+5700319 EB* 02 21 32.6020032936 +57 00 31.942301148     17.410   15.9528 G0.4V 6 0
19 2MASS J02213586+5705228 * 02 21 35.8644027936 +57 05 22.847354196     18.340   16.579 K1.1V 3 0
20 2MASS J02213620+5711087 * 02 21 36.2212561536 +57 11 08.702714148     17.8083   16.1938 G2.2V 3 0
21 ZTF J022139.70+571649.3 EB* 02 21 39.7017039264 +57 16 49.321123032     17.6489   16.0759 G4.6V 5 0
22 [CCR2014] 3262 V* 02 21 46.4574279072 +57 02 44.336809716     17.378   15.800 G4.2V 5 0
23 2MASS J02215790+5704047 * 02 21 57.9095999256 +57 04 04.757228040     18.165   16.479 K0.0V 3 0
24 2MASS J02220413+5722492 * 02 22 04.1361805608 +57 22 49.302488856     17.105   15.5631 F9.0V 3 0
25 2MASS J02220685+5707449 Em* 02 22 06.8577709512 +57 07 44.903735724 21.107   17.9330   16.1837 K0.7V 5 0
26 NGC 884 OpC 02 22 15.7 +57 08 59           ~ 503 0
27 ZTF J022221.64+570400.2 RS* 02 22 21.6496456152 +57 04 00.215039748     16.723   15.2832 G4.1V 10 0
28 2MASS J02223059+5714342 * 02 22 30.6035012448 +57 14 34.286127648     17.8367   16.1660 G7.3V 3 0
29 ZTF J022237.78+571303.9 EB* 02 22 37.7830153920 +57 13 03.955044504     17.4613   15.9506 F9.8V 8 0
30 2MASS J02223953+5715427 * 02 22 39.5338468968 +57 15 42.874001352     16.937   15.383 G0.2V 3 0
31 2MASS J02224860+5712367 * 02 22 48.6193432896 +57 12 36.673210620     18.2072   16.3537 G8.0V 3 0
32 2MASS J02232346+5703253 * 02 23 23.469 +57 03 25.32     17.4754   15.9288 G0.2V 3 0
33 2MASS J02233289+5706574 * 02 23 32.893 +57 06 57.44     17.7368   16.0951 G5.0V 3 0
34 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1453 0
35 2MASS J04542368+1709534 TT* 04 54 23.6741496384 +17 09 53.495824464     13.5     M3.4 62 1
36 CPD-68 1894 TT* 13 22 07.5421944624 -69 38 12.219391716   11.38 10.393   9.117 K1Ve 203 0
37 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
38 V* AK Sco Ae* 16 54 44.8491575376 -36 53 18.566586456 9.80 9.63 9.00     F5V 304 1
39 IC 1396 OpC 21 38 51.4 +57 31 52           ~ 523 1
40 Ass Cep OB 2 As* 21 51 +60.0           ~ 303 0
41 NGC 7160 OpC 21 53 44.8 +62 35 33   6.34 6.1     ~ 243 0

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