DEFPOS Hα observations of HII regions

Details DEFPOS Hα observations of HII regions DEFPOS Hα observations of HII regions

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011newa...16..485a&link_type=abstract

New Astronomy, Volume 16, Issue 8, p. 485-491.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present Hα emission line measurements of northern bright HII regions selected from the Sharpless (1959) catalog near the Galactic plane (b ⩽ ± 6°). A total of 10 HII regions were observed with DEFPOS (Dual Etalon Fabry-Perot Optical Spectrometer) system at the f/48 Coude focus of 150 cm RTT150 telescope located at TUBITAK National Observatory (TUG) in Antalya/Turkey. The intensities, the local standard of rest (LSR) velocities (VLSR), and the linewidths (Full Width Half Maximum: FWHM) of the Hα emission line from our observations were in the range of 84 to 745 Rayleigh (R [one Rayleigh (R) is 106/4π photons cm-2 sr-1 s-1 = 2.4110-7 erg cm-2 sr-1 s-1 at Hα and corresponds to an emission measure (EM=∫ne2dl) of 2.3 pc cm-6 for a gas temperature of 8000 K, where ne is the averaged electron density within an emitting region in the interstellar medium; dl is distance element to the source region (Haffner et al., 2003; Reynolds et al., 2005), 3 to -43 km s-1 and 30 to 73 km s-1, respectively. The LSR velocities and the linewidths from the data were obtained and compared with early results. We found that our results are in close agreement with them. Moreover, associated stars of some of the HII regions were updated by analyzing their location, velocities, and brightness.

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