Query : 2006A&A...450..593M

2006A&A...450..593M - Astronomy and Astrophysics, volume 450, 593-606 (2006/5-1)

Analysis of the circumstellar environment of the B[e] star HD 45677 (FS Canis Majoris).


Abstract (from CDS):

We studied the circumstellar environment of the B[e] star HD 45677 through the analysis of the emission lines from ionized metals. We used the statistical approach of the self absorption curve method (SAC) to derive physical parameters of the line emitting region.The Fe II and Cr II double-peaked emission line structure is explained by the presence of a thin absorption component red shifted by ∼3km/s. This absorption component can be interpreted geometricaly as being due to infalling material perpendicularly to the disk seen nearly pole-on, as indicated by the emission line structure. The Cr II and Fe II emission lines have a complex structure with two (narrow and broad) components, of 45 and 180km/s FWHM for the permitted lines and 25 and 100km/s FWHM for the forbidden ones, respectively. From our best data set of 1999, we obtained a Boltzmann-type population law whose excitation temperature is 3900–600+900K and 3150–300+350K for the narrow component lower and upper levels respectively. We obtained an excitation temperature of 3400–300+350K for the broad component upper levels. The forbidden lines are found to be formed in the outer regions with higher excitation temperatures of 10500±1000K and 8000±1500K for the narrow and broad components respectively in 1999. Our results are consistent with line formation in a rotating disk, around a young star. In the framework of a very simplified geometrical model, we argue that the narrow components are principaly emitted by an optically thin disk seen nearly pole-on, in a region whose minimum radius is estimated to be 4x1012cm, while the broad ones are formed in a disk-linked wind.

Abstract Copyright:

Journal keyword(s): line: formation - methods: data analysis - stars: emission-line, Be - stars: individual: HD 45677 (FS Canis Majoris)

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 HD 45677 Be* 06 28 17.4219710352 -13 03 11.128860972 7.86 8.52 8.50 8.11 8.01 B2IV/V[e] 318 0
2 V* KQ Pup s*r 07 33 47.9667844248 -14 31 26.054356260 6.67 6.38 4.97 3.41 2.08 M1Iabe+B2 186 0
3 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2335 0
4 V* RR Tel Sy* 20 04 18.5404499712 -55 43 33.153979080 9.93 11.33 10.81 11.689   M5e 527 0

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