J/A+A/638/A17 VLBA SiO masers toward V838 Monocerotis (Ortiz-Leon+, 2020)
SiO maser astrometry of the red transient V838 Monocerotis.
Ortiz-Leon G.N., Menten K.M., Kaminski T., Brunthaler A., Reid M.J.,
Tylenda R.
<Astron. Astrophys. 638, A17 (2020)>
=2020A&A...638A..17O 2020A&A...638A..17O (SIMBAD/NED BibCode)
ADC_Keywords: Novae ; Masers ; Interferometry
Keywords: masers - techniques: interferometric - astrometry - supergiants -
stars: distances - stars: individual: V838 Monocerotis
Abstract:
We present multi-epoch observations with the VLBA of SiO maser
emission in the v=1, J=1-0 transition at 43GHz from the remnant of
the red nova V838 Mon. We model the positions of maser spots to derive
a parallax of 0.166±0.060mas. Combining this parallax with other
distance information results in a distance of 5.6±0.5kpc, which
agrees with an independent geometric distance of 6.1±0.6kpc from
modeling polarimetry images of V838 Mon's light echo. Combining these
results, and including a weakly constraining Gaia DR2 parallax, yields
a best estimate of distance of 5.9±0.4kpc. The maser spots are
located close to the peaks of continuum at ∼225GHz and SiO J=5-4
thermal emission detected with ALMA. The proper motion of V838 Mon
confirms its membership in a small open cluster in the Outer spiral
arm of the Milky Way.
Description:
Data cubes of the SiO maser emission in the v=1, J=1-0 transition at
43.122080GHz are presented. The data were obtained with the Very Long
Baseline Array on 6 epochs (Table 1) with an spectral resolution of
0.2km/s. The images are 2048x2048 pixels in size. The velocity coverage
is 110km/s.
Objects:
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RA (2000) DE Designation(s)
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07 04 04.82 -03 50 50.6 V838 Mon = NOVA Mon 2002
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 90 7 VLBA observed epochs
list.dat 190 6 List of fits datacubes
fits/* . 6 Individual fits datacubes
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See also:
J/A+A/434/1107 : UBV(RI)c photometry of stars around V838 Mon (Munari+, 2005)
J/A+A/532/A138 : V838 Mon spectrum in 2009 (Tylenda+, 2011)
J/AZh/84/147 : Light curves of V838 Mon and V4332 Sgr (Goranskii+, 2007)
J/ApJ/598/L43 : Polarimetry of V838 Mon and stars around (Wisniewski+, 2003)
J/PAZh/28/764 : UBVR photometry of Nova Mon 2002 (V838 Mon) (Goranskii+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- ID BM464 identification
4- 13 A10 "date" Obs.date Observation Date
15- 27 F13.5 d JD Julian date
29- 32 F4.2 mas Amaj Beam Size, major axis
34- 37 F4.2 mas Bmin Beam Size, minor axis
39- 43 F5.1 deg PA [] Beam Size, position angle
45- 46 I2 mJy/beam rms rms
48- 90 A43 --- FileName Name of FITS file, in subdirectory fits
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 32 I3 --- Nz Number of slices
34- 43 A10 "date" Obs.date Observation date
45- 52 F8.2 m/s bVELO-LSR Lower value of VELO-LSR interval
54- 59 I6 m/s BVELO-LSR Upper value of VELO-LSR interval
61- 67 F7.3 m/s dVELO-LSR VELO-LSR resolution
69- 75 I7 Kibyte size Size of FITS file
77-119 A43 --- FileName Name of FITS file, in subdirectory fits
121-190 A70 --- Title Title of the FITS file
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Acknowledgements:
Gisela Ortiz-Leon, gortiz(at)mpifr-bonn.mpg.de
(End) Gisela Ortiz-Leon [MPIfR, Germany], Patricia Vannier [CDS] 18-May-2020