2000A&A...363..755K -
Astronomy and Astrophysics, volume 363, 755-766 (2000/11-2)
Low mass clouds in the Cepheus-Cassiopeia void. I. Khavtassi 15.
KISS C., TOTH L.V., MOOR A., SATO F., NIKOLIC S. and WOUTERLOOT J.G.A.
Abstract (from CDS):
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=1.6mag and a distance of 250±25pc 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 7K and a peak number density of n(H
2)=5.9x10
3cm
–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 34M
☉ and it is most probably part of a shell seen as a FIR loop called GIRL 126+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 ≤150pc 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.
Abstract Copyright:
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Journal keyword(s):
ISM: clouds - ISM: dust, extinction - ISM: molecules - ISM: individual objects: Kh 15 - ISM: individual objects: LDN 1308
Nomenclature:
Fig.7: [KTM2000] CN (Nos C1-C3).
CDS comments:
Fig.5: N=20 IRAS PSC sources 'NN', those without their IRAS HHMMm+DDMM designation are not in SIMBAD.
Simbad objects:
23
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