2012ApJ...759...48M


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.18CEST23:53:18

2012ApJ...759...48M - Astrophys. J., 759, 48 (2012/November-1)

Star formation activity in the galactic H II region Sh2-297.

MALLICK K.K., OJHA D.K., SAMAL M.R., PANDEY A.K., BHATT B.C., GHOSH S.K., DEWANGAN L.K. and TAMURA M.

Abstract (from CDS):

We present a multiwavelength study of the Galactic H II region Sh2-297, located in the Canis Major OB1 complex. Optical spectroscopic observations are used to constrain the spectral type of ionizing star HD 53623 as B0V. The classical nature of this H II region is affirmed by the low values of electron density and emission measure, which are calculated to be 756/cm3 and 9.15x105/cm6 pc using the radio continuum observations at 610 and 1280 MHz, and Very Large Array archival data at 1420 MHz. To understand local star formation, we identified the young stellar object (YSO) candidates in a region of area ∼7'.5x7'.5 centered on Sh2-297 using grism slitless spectroscopy (to identify the Hα emission line stars), and near infrared (NIR) observations. NIR YSO candidates are further classified into various evolutionary stages using color-color and color-magnitude (CM) diagrams, giving 50 red sources (H - K > 0.6) and 26 Class II-like sources. The mass and age range of the YSOs are estimated to be ∼0.1-2 M and 0.5-2 Myr using optical (V/V-I) and NIR (J/J-H) CM diagrams. The mean age of the YSOs is found to be ∼1 Myr, which is of the order of dynamical age of 1.07 Myr of the H II region. Using the estimated range of visual extinction (1.1-25 mag) from literature and NIR data for the region, spectral energy distribution models have been implemented for selected YSOs which show masses and ages to be consistent with estimated values. The spatial distribution of YSOs shows an evolutionary sequence, suggesting triggered star formation in the region. The star formation seems to have propagated from the ionizing star toward the cold dark cloud LDN1657A located west of Sh2-297.

Abstract Copyright:

Journal keyword(s): dust, extinction - H II regions - infrared: ISM - ISM: individual: Sh2-297 - radio continuum: ISM - stars: formation

VizieR on-line data: <Available at CDS (J/ApJ/759/48): table2.dat table3.dat>

Nomenclature: Table 2: [MOS2012] NN (Nos 1-97)

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 15

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Number of rows : 15

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 BD+52 913 WD* 05 05 30.6182785658 +52 49 51.920797126 10.25 11.44 11.69 11.93 12.108 DA.8 1010 0
2 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1318 1
3 IC 2177 RNe 07 04 25 -10 27.3           ~ 146 2
4 [LKB2010] LDN 1657A-2 cor 07 04 58.03 -12 16 50.8           ~ 2 0
5 [LKB2010] LDN 1657A-3 cor 07 05 00.69 -12 16 44.7           ~ 4 0
6 LDN 1657A DNe 07 05 05.8 -12 18 29           ~ 7 0
7 NAME UYSO 1 Y*O 07 05 11 -12 19.0           ~ 10 0
8 LBN 1039 HII 07 05 13 -12 19.0           ~ 42 0
9 HD 53623 * 07 05 16.7477934484 -12 19 34.492738033 7.02 8.88 8.87 8.84   B1II/III 68 1
10 LBN 1037 RNe 07 05 16.9 -12 20 02           ~ 24 0
11 LBN 1033 HII 07 05.9 -11 13           ~ 43 1
12 HD 53975 SB* 07 06 35.9656022838 -12 23 38.216531612 5.38 6.40 6.50 6.51   O7.5Vz 183 0
13 NAME CMa OB1 As* 07 07.0 -10 28           ~ 128 0
14 NAME CMa R1 As* 07 08 21.3 -11 04 50           ~ 77 1
15 HD 54662 SB* 07 09 20.2488124291 -10 20 47.627880802 5.35 6.24 6.21 7.23   O6.5Vz(n)+O7.5Vz 325 2

    Equat.    Gal    SGal    Ecl

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