2004A&A...425..151G


Query : 2004A&A...425..151G

2004A&A...425..151G - Astronomy and Astrophysics, volume 425, 151-162 (2004/10-1)

Interstellar absorption lines toward Cep OB4.

GREDEL R.

Abstract (from CDS):

An analysis of optical echelle spectra towards nine stars in the Cep OB4 association is presented. Interstellar absorption lines which arise in the (1, 0) and (2, 0) bands of the CN A 2Π - X 2Σ+ red system towards BD+66° 1661, BD+66° 1674, and BD+66° 1675 are used to infer accurate CN column densities N(CN). A comparison with earlier measurements in the CN violet system allows to infer a CN Doppler b parameter of b(CN)=1.2-2.4km/s. Molecular carbon absorption lines which arise in the (1, 0), (2, 0) and (3, 0) bands of the C2A1Πu-X1Σg+ Phillips system is used to infer gaskinetic temperatures of 35±10K and densities of n=700±200cm–3 towards BD+66° 1661 and BD+66° 1675, and a temperature of 60±10K and a density of 800±400cm–3 towards BD+66° 1674. The R(1) line of the (0, 0) band of the CHA2Δ-X2Π system is detected towards 6 stars. A tight correlation exists between N(C2) and N(CH). N(CN) increases with N(CH) and with N(C2). Interstellar CH+ is marginally detected towards four stars. Inferred CH+ column densities are significantly lower than towards other lines of sight with similar reddening. The velocity structure towards Cep OB4 and the chemical abundances suggest that CN, C2, CH, and CH+ are formed in quiescent material. A previous suggestion that the molecules form in a photon-dominated region close to the stars is not supported by the observations.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: clouds - ISM: molecules - ISM: lines and bands

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 BD+66 1669 EB* 00 00 29.27386 +67 13 00.4034 12.23 12.43 11.08     B1 24 0
2 V* V747 Cep SB* 00 01 46.8678793584 +67 30 25.102332180 11.6 11.38 10.07     O5.5V(n)((f)) 48 0
3 Ass Cep OB 4 As* 00 02 +67.7           ~ 72 1
4 BD+66 1674 * 00 02 10.2414638448 +67 25 45.186308256 10.76 10.67 9.60     O9.7IV 42 0
5 BD+66 1675 * 00 02 10.2887046096 +67 24 32.228861796 10.18 10.16 9.08     O7.5Vz 85 0
6 Cl Berkeley 59 OpC 00 02 17 +67 26.5           ~ 84 0
7 V* V399 Cep Or* 00 04 48.9452040216 +68 11 19.301464104 9.48 9.88 9.25 9.18   B2 34 0
8 BD+66 1661 * 23 57 32.6036981472 +67 33 15.293987460 9.33 9.41 8.76     O9.2V 58 0
9 BD+67 1580 * 23 57 36.6452181552 +67 50 40.824275244   10.68 10.17     B3 9 0
10 BD+65 1973 * 23 58 27.5328740760 +65 54 48.189156912   10.93 10.55     B2 10 0
11 BD+67 1585 * 23 59 57.6557013624 +67 51 17.910248976 10.82 10.92 10.33     B5 13 0

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2022.05.21-15:51:51

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