Near-Infrared Observations of Circumnuclear Star Formation in NGC 3351, NGC 3504, and NGC 5248

1997 ◽  
Vol 114 ◽  
pp. 1850 ◽  
Author(s):  
Debra Meloy Elmegreen ◽  
Frederick R. Chromey ◽  
Michael Santos ◽  
Daniel Marshall
Keyword(s):  
Star Formation ◽  
Near Infrared ◽  
Infrared Observations

scholarly journals Luminosity function, star density, and star formation efficiency in regions of star formation - near infrared observations -

1991 ◽  
Vol 147 ◽  
pp. 289-292
Author(s):  
Klaus-Werner Hodapp ◽  
John Rayner ◽  
Hua Chen
Keyword(s):  
Star Formation ◽  
Luminosity Function ◽  
Near Infrared ◽  
Hii Regions ◽  
Young Stars ◽  
Young Age ◽  
Infrared Observations ◽  
Star Density ◽  
Many Sources ◽  
Formation Efficiency

Clusters of young stars have been found near a number of compact HII regions. These clusters do not show a turnover in the K-band luminosity and are probably several million years old. In L 1641 only moderate clustering tendency has been observed and many sources show signs of extremely young age.

scholarly journals Relative CNO Abundances in Upper AGB Stars of the Magellanic Clouds. A Search for Envelope Burning

1989 ◽  
Vol 106 ◽  
pp. 152-152
Author(s):  
J.M. Brett ◽  
M.S. Bessell
Keyword(s):  
Star Formation ◽  
Temperature Dependence ◽  
Near Infrared ◽  
Small Sample ◽  
Magellanic Clouds ◽  
Agb Stars ◽  
Infrared Observations ◽  
Burning Process ◽  
Synthetic Spectra ◽  
Cno Abundances

We have investigated the atmospheric abundances of upper AGB stars of the SMC, searching in particular for evidence of the hypothetical envelope burning process. To this end we have computed synthetic spectra with varying C, N, and 0 abundances selected by considering the effect of the processes of the 3rd dredge up and envelope burning of a degree sufficient to prevent C star formation. The synthetic spectra (covering 0.5 μm to 2.5 μm) were analysed for observable effects of these two atmospheric enrichment processes. By analysis of band strengths of TiO, CO and CN we have found that substantial envelope burning is detectable for stars with Teff ≥ 3000 K but not below, due to the temperature dependence of CN bands. The synthetic spectra were compared to near-infrared and infrared observations of a small sample of SMC upper AGB stars thought to be prime candidates for the occurrence of envelope burning. This comparison indicated that envelope burning, of the extent considered here, is not occurring in these stars but rather the spectra are consistent with mild C enhancements produced by the 3rd dredge up alone.

Near?Infrared Observations of N11 in the Large Magellanic Cloud: Triggered Star Formation around the Periphery of LH 9

2006 ◽  
Vol 132 (6) ◽  
pp. 2653-2664 ◽  
Author(s):  
Hirofumi Hatano ◽  
Ryota Kadowaki ◽  
Yasushi Nakajima ◽  
Motohide Tamura ◽  
Tetsuya Nagata ◽  
...  
Keyword(s):  
Star Formation ◽  
Near Infrared ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Infrared Observations

Understanding the Star Formation Process in the Filamentary Dark Cloud GF 9: Near-Infrared Observations

1998 ◽  
Vol 116 (1) ◽  
pp. 349-359 ◽  
Author(s):  
David R. Ciardi ◽  
Charles E. Woodward ◽  
Dan P. Clemens ◽  
David E. Harker ◽  
Richard J. Rudy
Keyword(s):  
Star Formation ◽  
Formation Process ◽  
Near Infrared ◽  
Dark Cloud ◽  
Infrared Observations

scholarly journals Luminosity function, star density, and star formation efficiency in regions of star formation - near infrared observations -

1991 ◽  
Vol 147 ◽  
pp. 289-292
Author(s):  
Klaus-Werner Hodapp ◽  
John Rayner ◽  
Hua Chen
Keyword(s):  
Star Formation ◽  
Luminosity Function ◽  
Near Infrared ◽  
Hii Regions ◽  
Young Stars ◽  
Young Age ◽  
Infrared Observations ◽  
Star Density ◽  
Many Sources ◽  
Formation Efficiency

Clusters of young stars have been found near a number of compact HII regions. These clusters do not show a turnover in the K-band luminosity and are probably several million years old. In L 1641 only moderate clustering tendency has been observed and many sources show signs of extremely young age.

scholarly journals The conditions for star formation at low metallicity: results from the LMC

2006 ◽  
Vol 2 (S237) ◽  
pp. 459-459
Author(s):  
J. M. Oliveira ◽  
J. Th. van Loon ◽  
S. Stanimirović
Keyword(s):  
Star Formation ◽  
Recent Work ◽  
Massive Star ◽  
Near Infrared ◽  
Large Magellanic Cloud ◽  
Irradiation Effects ◽  
Space Telescope ◽  
Infrared Observations ◽  
Low Metallicity ◽  
Water Masers

AbstractWe present our recent work on the conditions under which star formation occurs in a metal-poor environment, the Large Magellanic Cloud ([Fe/H] ~ −0.4). Water masers are used as beacons of the current star formation in H II regions. Comparing their location with the dust morphology imaged with the Spitzer Space Telescope, and additional Hα imaging and groundbased near-infrared observations, we conclude that the LMC environment seems favourable to sequential star formation triggered by massive star feedback (Oliveira et al. 2006). Good examples of this are 30 Doradus and N 113. There are also H II regions, such as N 105A, where feedback may not be responsible for the current star formation although the nature of one young stellar object (YSO) suggests that feedback may soon start making an impact. The chemistry in one YSO hints at a stronger influence from irradiation effects in a metal-poor environment where shielding by dust is suppressed (van Loon 2005).

scholarly journals Accretion and Outflow Activity in the Earliest Phases of Star-Formation: CO, Sub-mm Continuum, and Near-Infrared Observations

1997 ◽  
Vol 163 ◽  
pp. 725-726
Author(s):  
K.-W. Hodapp ◽  
E. F. Ladd
Keyword(s):  
Near Infrared ◽  
Spectral Energy Distribution ◽  
Far Infrared ◽  
Point Sources ◽  
Spectral Energy ◽  
Infrared Observations ◽  
Circumstellar Material ◽  
Dense Cores ◽  
Wavelength Radiation ◽  
Main Component

Stars in the earliest phases of their formation, i.e., those accreting the main component of their final mass, are deeply embedded within dense cores of dust and molecular material. Because of the high line-of-sight extinction and the large amount of circumstellar material, stellar emission is reprocessed by dust into long wavelength radiation, typically in the far-infrared and sub-millimeter bands. Consequently, the youngest sources are strong submillimeter continuum sources, and often undetectable as point sources in the near-infrared and optical. The most deeply embedded of these sources have been labelled “Class 0” sources by André, Ward-Thompson, & Barsony (1994), in an extension of the spectral energy distribution classification scheme first proposed by Adams, Lada, & Shu (1987).

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