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Title: STAR FORMATION ACTIVITY IN THE GALACTIC H II REGION Sh2-297

Abstract

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 cm{sup -3} and 9.15 Multiplication-Sign 10{sup 5} cm{sup -6} 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 {approx}7.'5 Multiplication-Sign 7.'5 centered on Sh2-297 using grism slitless spectroscopy (to identify the H{alpha} 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 {approx}0.1-2 M {sub Sun} 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 {approx}1 Myr,more » 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.« less

Authors:
; ;  [1];  [2];  [3];  [4];  [5];  [6]
  1. Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai (Bombay) 400005 (India)
  2. Laboratoire d'Astrophysique de Marseille (UMR 6110 CNRS and Universite de Provence), 38 rue F. Joliot-Curie, F-13388 Marseille Cedex 13 (France)
  3. Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital 263129 (India)
  4. Indian Institute of Astrophysics, Koramangala, Bangalore 560034 (India)
  5. National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune 411007 (India)
  6. National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan)
Publication Date:
OSTI Identifier:
22086462
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; COLOR; COSMIC DUST; DIAGRAMS; ELECTRON DENSITY; ENERGY SPECTRA; GAMMA SPECTROSCOPY; H2 REGIONS; MASS; MHZ RANGE; PHOTON EMISSION; SPATIAL DISTRIBUTION; STARS

Citation Formats

Mallick, K. K., Ojha, D. K., Dewangan, L. K., Samal, M. R., Pandey, A. K., Bhatt, B. C., Ghosh, S. K., and Tamura, M., E-mail: kshitiz@tifr.res.in. STAR FORMATION ACTIVITY IN THE GALACTIC H II REGION Sh2-297. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/1/48.
Mallick, K. K., Ojha, D. K., Dewangan, L. K., Samal, M. R., Pandey, A. K., Bhatt, B. C., Ghosh, S. K., & Tamura, M., E-mail: kshitiz@tifr.res.in. STAR FORMATION ACTIVITY IN THE GALACTIC H II REGION Sh2-297. United States. doi:10.1088/0004-637X/759/1/48.
Mallick, K. K., Ojha, D. K., Dewangan, L. K., Samal, M. R., Pandey, A. K., Bhatt, B. C., Ghosh, S. K., and Tamura, M., E-mail: kshitiz@tifr.res.in. Thu . "STAR FORMATION ACTIVITY IN THE GALACTIC H II REGION Sh2-297". United States. doi:10.1088/0004-637X/759/1/48.
@article{osti_22086462,
title = {STAR FORMATION ACTIVITY IN THE GALACTIC H II REGION Sh2-297},
author = {Mallick, K. K. and Ojha, D. K. and Dewangan, L. K. and Samal, M. R. and Pandey, A. K. and Bhatt, B. C. and Ghosh, S. K. and Tamura, M., E-mail: kshitiz@tifr.res.in},
abstractNote = {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 cm{sup -3} and 9.15 Multiplication-Sign 10{sup 5} cm{sup -6} 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 {approx}7.'5 Multiplication-Sign 7.'5 centered on Sh2-297 using grism slitless spectroscopy (to identify the H{alpha} 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 {approx}0.1-2 M {sub Sun} 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 {approx}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.},
doi = {10.1088/0004-637X/759/1/48},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}