Internal radial velocities of some selected small diameterHii regions

Williamson, Robert C.

doi:10.1007/bf00653619

Cited by 8 publications

(1 citation statement)

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“…The radial velocity with respect to the local standard of rest (V LSR ), the full width at half maximum (FWHM), and the intensity of the Hα emission line are obtained very precisely by DEFPOS observations. V LSR can be used for investigating the internal mechanisms such as the turbulence and inhomogeneities (Courtès et al 1962;Williamson 1970). Measuring the FWHM of the Hα and another emission line from a heavier atom (e.g.…”

Section: Introductionmentioning

confidence: 99%

DEFPOS Hα observations of the W80 Complex

Aksaker

2013

Res. Astron. Astrophys.

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We present Hα emission line measurements of the W80 nebula complex. A total of 26 regions have been observed inside the nebula with the Dual Etalon Fabry-Perot Optical Spectrometer system at the f/48 Coudé focus of the 150 cm RTT150 telescope located at TUBITAK National Observatory in Antalya, Turkey. The intensities, local standard of rest velocities, heliocentric radial velocities and linewidths for full width at half maximum of the Hα emission lines have been determined from these observations. They lie in the range of 259 to 1159 Rayleigh (R; 1R = 106/4π photons cm−2 sr−1 s−1 = 2.41 × 10−7 erg cm−2 sr−1 s−1 at Hα), 4 to 12 km s−1, −3 to −11 km s−1 and 44 to 55 km s−1, respectively. The radial velocity measurements show that there are several maxima and minima inside W80. The new results confirm findings in the literature that the complex seems to be rather uniform in terms of radial velocity and no turbulent motion is seen inside the complex. The average value of the calculated emission measure for the region is 3.1 pc cm−6.

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Section: Introductionmentioning

confidence: 99%