2007A&A...469..201G

Query : 2007A&A...469..201G

2007A&A...469..201G - Astronomy and Astrophysics, volume 469, 201-206 (2007/7-1)

Electron density and carriers of the diffuse interstellar bands.

GNACINSKI P., SIKORSKI J.K. and GALAZUTDINOV G.A.

Abstract (from CDS):

We have used the ionisation equilibrium equation to derive the electron density in interstellar clouds in the direction of 13 stars. A linear relation was found that allows determination of the electron density from the MgI and MgII column densities in diffuse clouds. The comparison of a normalised equivalent width of 12 DIBs with the electron density shows that the DIBs equivalent width do not change with electron density varying in the range n_e=0.01/2.5cm^–3. Therefore the DIBs carriers (1) can be observed only in one ionisation stage, or (2) the DIBs are arising in cloud regions (eg. cores or cloud coronas) for which we cannot determine the electron density.

Abstract Copyright: ∼

Journal keyword(s): ISM: clouds - ISM: molecules

Simbad objects: 13

Full paper

View the references in ADS

Number of rows : 13

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	V* X Per	HXB	03 55 23.0777456088	+31 02 45.039836148	6.090	6.840	6.720			O9.5III	962	0
2	* ksi Per	**	03 58 57.9022917	+35 47 27.713205	3.190	4.080	4.060	3.88	3.89	O7.5III(n)((f))	825	0
3	V* HX Vel	**	08 42 16.1925159528	-48 05 56.748130241	4.39	5.288	5.468	7.877	7.074	B2/3IV/V	120	0
4	* rho Leo	s*b	10 32 48.6716770	+09 18 23.709445	2.780	3.720	3.870	3.90	4.06	B1Iab	527	0
5	* b Sco	*	15 50 58.7444628720	-25 45 04.658676984	3.84	4.552	4.635			B1.5Vn	289	0
6	* sig Sco	bC*	16 21 11.3157134	-25 35 34.051476	2.32	3.02	2.89	1.69	1.58	B1III+B1:V	861	0
7	* zet Oph	Be*	16 37 09.5390545	-10 34 01.529471	1.73	2.58	2.56	2.46	2.50	O9.2IVnn	1824	2
8	* kap Sco	bC*	17 42 29.27520	-39 01 47.9391	1.32	2.211	2.386			B1.5III	238	0
9	* ups Cyg	Be*	21 17 55.0858548408	+34 53 48.825463560	3.50	4.32	4.42	4.37	4.45	B2Vne	314	0
10	HD 203374	Be*	21 19 07.3685524992	+61 51 30.436799148	6.23	6.908	6.674			B0IVpe	130	0
11	HD 206267	SB*	21 38 57.6195772032	+57 29 20.554016280	5.09	5.83	5.62		5.56	O6.0V((f))+O9:V	494	0
12	HD 209339	**	22 00 39.2649125112	+62 29 16.063886004	5.9	8.73	8.51	7.61		O9.7IV	183	0
13	* lam Cep	s*b	22 11 30.5765111040	+59 24 52.154264880	4.55	5.29	5.05	4.77	4.62	O6.5I(n)fp	680	1

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