1999MNRAS.302..714N

Query : 1999MNRAS.302..714N

1999MNRAS.302..714N - Mon. Not. R. Astron. Soc., 302, 714-722 (1999/February-1)

ROSAT observations of Cepheus OB3: the discovey of low-mass stars.

NAYLOR T. and FABIAN A.C.

Abstract (from CDS):

We present X-ray images of the high-mass star-forming region Cepheus OB3, in which we discover over 50 point sources, the majority of which are T Tauri stars. We use the ratio of high-mass to low-mass stars to constrain the initial mass function, and find that it is consistent with that for field stars. This supports the picture that there is little difference between high-mass and low-mass star-forming regions. The presence of low-mass stars between the high-mass stars and the molecular cloud they are ionizing argues against mechanisms whereby heating of the cloud inhibits low-mass star formation. Finally, the efficiency of star formation in this region is shown to be of the order of a few per cent.

Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): stars: formation - stars: luminosity function, mass function - stars: pre - open clusters and associations: general - open clusters and associations: individual: Cepheus OB3 - X-rays: stars

Nomenclature: Table 2: [NF99] NN (Nos 1-56).

Simbad objects: 61

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Number of rows : 61
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 NAME Ori I As* 05 38 -02.8           ~ 653 0
2 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
3 GSC 04282-00772 X 22 54 18.1 +62 40 11     9.3     ~ 1 0
4 [NF99] 2 X 22 54 23.8 +62 35 53           ~ 1 0
5 [NF99] 3 X 22 54 41.6 +62 41 30           ~ 1 0
6 [NF99] 4 X 22 54 43.7 +62 40 21           ~ 1 0
7 [NF99] 5 X 22 54 56.2 +62 42 47           ~ 1 0
8 GSC 04282-00780 Y*O 22 54 57.3161197344 +62 34 18.027345288   11.177 10.381 10.872   B2.5V 17 0
9 [NF99] 7 X 22 55 01.2 +62 33 38           ~ 1 0
10 LS III +62 27 Y*O 22 55 03.9823083672 +62 49 33.787468884   12.46 12.22   11.58 B 14 0
11 1RXS J225508.2+624406 X 22 55 07.4 +62 44 21           ~ 1 0
12 [NF99] 10 X 22 55 08.0 +62 39 03           ~ 1 0
13 [NF99] 11 X 22 55 17.8 +62 38 07           ~ 1 0
14 [NF99] 12 X 22 55 22.2 +62 54 49           ~ 1 0
15 [NF99] 13 * 22 55 27.0 +62 43 32     15.3     K 1 0
16 [NF99] 14 X 22 55 29.1 +62 47 38     16.94     ~ 2 0
17 [NF99] 15 X 22 55 31.2 +62 33 11     15.1     ~ 1 0
18 2MASS J22553745+6241280 Or* 22 55 37.3985671992 +62 41 28.222503216 18.269   16.58   14.65 ~ 8 0
19 [NF99] 17 X 22 55 38.0 +62 47 52           ~ 1 0
20 2MASS J22553931+6251006 Y*O 22 55 39.345 +62 51 00.54   12.85 12.08 12.00   ~ 4 0
21 [NF99] 19 X 22 55 48.7 +62 40 06           ~ 1 0
22 [NF99] 20 TT* 22 56 01.1 +62 47 54     17.94     K 2 0
23 TYC 4282-550-1 Or* 22 56 07.2666913776 +62 45 35.861107680 13.408 12.17 12.11   11.18 ~ 6 0
24 1RXS J225612.5+625452 X 22 56 10.1 +62 54 44           ~ 1 0
25 [NF99] 23 X 22 56 15.8 +62 40 14     13.3     ~ 1 0
26 2MASS J22561829+6245166 Or* 22 56 18.2981023440 +62 45 16.572887532 22.197   18.23   15.31 ~ 9 0
27 2MASS J22562007+6252228 TT* 22 56 20.0837488488 +62 52 22.880213652 20.787   16.74   14.42 K 5 0
28 [NF99] 25 * 22 56 20.4 +62 43 26     14.6     K 1 0
29 2MASS J22562637+6241289 Or* 22 56 26.3717452968 +62 41 29.046513408 18.560   15.41   13.53 ~ 8 0
30 GSC 04282-00472 Or* 22 56 27.2329878672 +62 39 19.840007160 16.778   13.89   12.10 K 7 0
31 [NF99] 29 TT* 22 56 28.6 +62 45 29     15.5     K 3 0
32 HD 217035 bC* 22 56 30.941664 +62 52 06.31128 7.66         B0.5Vn+B0.5V 101 0
33 [NF99] 31 X 22 56 35.2 +62 56 02           ~ 1 0
34 [D75b] Em* 22-142 Or* 22 56 36.5298462144 +62 40 07.807749780 15.721   13.01   11.26 G 9 0
35 2MASS J22563678+6246031 Y*O 22 56 36.79 +62 46 03.1 18.616   15.51   14.06 K 5 0
36 2MASS J22563865+6237140 TT* 22 56 38.6650341984 +62 37 14.201237028 18.366 16.31 14.62   12.37 K 9 0
37 2MASS J22563906+6245092 Or* 22 56 39.0396033864 +62 45 09.125142372 18.494   15.01   13.04 F 9 0
38 [NF99] 36 X 22 56 39.3 +62 45 35           ~ 1 0
39 2MASS J22564371+6242017 Or* 22 56 43.7197297080 +62 42 01.755409428 21.455   17.69   15.16 ~ 7 0
40 [NF99] 38 X 22 56 46.5 +62 41 17           ~ 2 0
41 HD 217086 Y*O 22 56 47.1887590800 +62 43 37.657173900 7.88 8.30 7.66 8.35   O7Vnn((f))z 263 0
42 [NF99] 40 X 22 56 51.9 +62 36 09           ~ 1 0
43 [NF99] 41 X 22 56 52.7 +62 39 06           ~ 1 0
44 RX J2256.9+6242 Y*O 22 56 55.292400 +62 42 24.08112 19.599   15.88 15.159 13.87 ~ 11 0
45 GSC 04282-00450 * 22 56 56.3799438888 +62 52 42.223999080   15.33 14.16 14.01   ~ 3 0
46 [NF99] 43 * 22 56 57.1633450464 +62 55 35.482580580           ~ 1 0
47 ZTF J225700.68+624548.6 Or* 22 57 00.6871386072 +62 45 48.559197060 20.779         ~ 9 0
48 ZTF J225702.08+624407.1 Or* 22 57 02.0936564616 +62 44 07.106698572 19.019   15.30   13.27 K 10 0
49 LBN 110.11+02.44 HII 22 57 06 +62 38.2           ~ 103 0
50 [NF99] 47 X 22 57 06.2 +62 38 28     15.6     ~ 1 0
51 [NF99] 48 X 22 57 06.5 +62 38 48     15.15     ~ 2 0
52 [NF99] 49 X 22 57 08.4 +62 33 28           ~ 1 0
53 [NF99] 50 X 22 57 15.0 +62 26 10           ~ 1 0
54 [NF99] 51 X 22 57 26.2 +62 49 39           ~ 1 0
55 2MASS J22572985+6243531 Or* 22 57 29.8556337816 +62 43 53.276691756           ~ 6 0
56 [NF99] 53 X 22 57 37.8 +62 42 32           ~ 1 0
57 [NF99] 54 X 22 57 43.2 +62 49 29           ~ 1 0
58 [NF99] 55 X 22 57 52.1 +62 52 18           ~ 1 0
59 [NF99] 56 X 22 59 14.8 +62 37 47           ~ 1 0
60 NAME III CEP ASSOC As* 23 04.2 +63 24           ~ 332 0
61 NAME Cep B/SH2-155/CEP OB3 Complex ? ~ ~           ~ 4 0

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