2004A&A...414..591D


Query : 2004A&A...414..591D

2004A&A...414..591D - Astronomy and Astrophysics, volume 414, 591-600 (2004/2-1)

Polarimetric evolution of V838 Monocerotis.

DESIDERA S., GIRO E., MUNARI U., EFIMOV Yu.S., HENDEN A., BENETTI S., TOMOV T., BIANCHINI A. and PERNECHELE C.

Abstract (from CDS):

We present the results of our polarimetric and spectropolarimetric monitoring of V838 Monocerotis, performed at the Asiago and Crimean observatories during and after the multiple outbursts that occurred in January-March 2002. The polarization of the object is mainly due to interstellar polarization (P∼2.48%). Intrinsic polarization up to ∼0.7% at 5000Å is present during the second maximum of the object (February 2002). This intrinsic component increases toward shorter wavelengths but our limited spectral coverage (5000-7500Å) does not allow conclusive inferences about its origin. A strong depolarization across the Hα profile is observed. The interstellar polarization gives a lower limit to the reddening of E(B-V)>0.28, with E(B-V)∼0.5 being the most probable value. A normal ratio of total to selective absorption (RV=3.22±0.17) was derived from the wavelength of maximum interstellar polarization. This suggests a low (if any) contribution by circumstellar material with a peculiar dust to gas ratio. A polarimetric map of a portion of the light echo shows a complex polarization distribution reaching Pmax=45%.

Abstract Copyright:

Journal keyword(s): stars: individual: V838 Mon - techniques: polarimetric - stars: peculiar (except chemically peculiar)

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 - 2024
#notes
1 * bet Cas dS* 00 09 10.68518 +59 08 59.2120 2.73 2.61 2.27 1.97 1.77 F2III 531 0
2 HD 14069 * 02 16 45.1936420248 +07 41 10.637150532   9.21 9.06     A0 51 0
3 HD 42807 RS* 06 13 12.5028624208 +10 37 37.712484445   7.12   6.0   G5V 235 0
4 * 9 Gem s*b 06 16 58.7058631680 +23 44 27.284070336 6.31 6.70 6.25 5.78 5.38 B3Iab 241 0
5 V* V838 Mon No* 07 04 04.8221494992 -03 50 50.648894412       15.181 14.51 M10+B3V 429 0
6 HD 93521 * 10 48 23.5113981120 +37 34 13.083332412 5.67 6.79 7.03     O9.5IIInn 427 1
7 HD 98421 * 11 18 31.8504459024 -60 49 16.662750456   9.86 9.61     A0V 3 0
8 * bet Vir PM* 11 50 41.7185158616 +01 45 53.001539131 4.26 4.15 3.60 3.13 2.85 F9V 930 0
9 * bet Com PM* 13 11 52.3938268062 +27 52 41.462309460 4.92 4.84 4.25 3.77 3.47 F9.5V 909 0
10 V* V4444 Sgr No* 18 07 36.19944 -27 20 13.2144           ~ 35 0
11 HD 204847 PM* 21 31 24.9693111408 -04 31 39.347161212   9.39 8.94     F5/6V 4 0

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