C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST14:35:09

2004A&A...425..133B - Astronomy and Astrophysics, volume 425, 133-141 (2004/10-1)

Star count analysis of the interstellar matter in the region of L1251.


Abstract (from CDS):

We studied the ISM distribution in and around the star forming cloud L1251 with optical star counts. A careful calculation with a maximum likelihood based statistical approach resulted in B, V, R, I extinction distributions from the star count maps. A distance of 330±30pc was derived. The extinction maps revealed an elongated dense cloud with a bow shock at its eastern side. We estimated a Mach number of M≃2 for the bow shock. A variation of the apparent dust properties is detected, i.e. the RV=AV/EB–V total to selective extinction ratio varies from 3 to 5.5, peaking at the densest part of L1251. The spatial structure of the head of L1251 is well modelled with a Schuster-sphere (i.e. n=5 polytropic sphere). The observed radial distribution of mass fits the model with high accuracy out to 2.5 pc distance from the assumed center. Unexpectedly, the distribution of NH3 1.3cm line widths is also well matched by the Schuster solution even in the tail of the cloud. Since the elongated head-tail structure of L1251 is far from the spherical symmetry the good fit of the linewidths in the tail makes it reasonable to assume that the present cloud structure has been formed by isothermal contraction.

Abstract Copyright:

Journal keyword(s): ISM: individual object: L1251

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
1 HD 203854 * 21 20 21.4519302247 +72 20 36.067459282   9.64 9.14     A2 13 0
2 LDN 1251 DNe 22 36.1 +75 16           ~ 97 0
3 NAME Cep Flare MoC 23 34 +72.0           ~ 102 0

    Equat.    Gal    SGal    Ecl

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