Low mass clouds in the Cepheus-Cassiopeia void. I. Khavtassi 15

Details Low mass clouds in the Cepheus-Cassiopeia void. I. Khavtassi 15 Low mass clouds in the Cepheus-Cassiopeia void. I. Khavtassi 15

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...363..755k&link_type=abstract

Astronomy and Astrophysics, v.363, p.755-766 (2000)

Astronomy and Astrophysics

Astrophysics

8

Ism: Clouds, Ism: Dust, Extinction, Ism: Molecules, Ism: Individual Objects: {Kh 15}, Ism: Individual Objects: {Ldn 1308}

Scientific paper

We present the results of optical, far-infrared and radio observations of the small, non-star forming dark cloud Khavtassi 15, located in the Upper Cepheus-Cassiopeia region. We derive an average extinction of A_V = 1fm6 and a distance of 250+/- 25 pc from Digitized Sky Survey data and star counts using objective prism spectroscopy. A fully computerized algorithm was used for non-biased analysis of starcount data. A kinetic temperature of 7 K and a peak number density of n(H_2) = 5.9x 103 cm-3 were estimated from multiisotopic, multilevel CO measurements. CO measurements also revealed three main condensations inside the cloud. Kh 15 has a total gas mass of 34 Msun and it is most probably part of a shell seen as a FIR loop called GIRL126+10. We investigated the correlation among optical extinction, radio and FIR emission and masses derived for the dust and gas inside the cloud core. Stability analysis has shown, that \object{Kh 15} is not far from gravitational virial equilibrium, and may be fully stabilized by the external pressure. In addition to Kh 15, the starcounts also indicate the presence of an extended nearby extinction layer at d <= 150 pc which we consider as the wall of the Local Bubble (LB) towards the Upper Cepheus-Cassiopeia. Distances of the dark clouds LDN 1308, LDN 1333 and Khavtassi 19 are also estimated.

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