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J/ApJ/484/394 AX Mon photometry and UV spectra (Elias+ 1997)
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New Perspectives on AX Monocerotis
Elias N.M.II, Wilson R.E., Olson E.C., Aufdenberg J.P., Guinan E.F.,
Guedel M., Van Hamme W.V., Stevens H.L.
<Astrophys. J. 484, 394 (1997)>
=1997ApJ...484..394E
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ADC_Keywords: Binaries, spectroscopic ; Photometry, UBV ; Photometry, uvby ;
Radial velocities ; Spectra, ultraviolet
Keywords: binaries: spectroscopic - circumstellar matter -
radio continuum: stars - stars: emission-line, Be -
stars: individual (AX Monocerotis) - ultraviolet: stars
Abstract:
AX Monocerotis is a 232d, noneclipsing, interacting binary star that
consists of a K giant, a Be-like giant, and a large amounts of
circumstellar material. The K star is almost certainly a synchronous
rotator and is probably in contact with its critical lobe. The Be star
was believed to be a rapid rotator based on extremely wide absorption
lines, but new spectra show that these lines arise from the
circumstellar environment. Hydrogen emission, also circumstellar, is
many times stronger than the continuum. Near-ultraviolet light curves
exhibit a 0.5 mag dip near phase 0.75, but there is no such
variability at longer wavelengths. Gas flow trajectories from the cusp
of the K star toward the Be star provide a simple explanation for the
photometric and spectroscopic behavior. We may have found a decreasing
orbital period, but more data are necessary to confirm this result. We
present several models for AX Mon based on (1) new and archival
visible photometry, (2) archival ultraviolet spectroscopy,
(3) new and archival visible spectroscopy, (4) new visible
polarimetry, and (5) new radio photometry. Further observations,
including optical interferometry, are proposed.
Objects:
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RA (2000) DE Designation(s)
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06 30 32.9 +05 52 00 AX Mon
06 36 25.8 +06 04 59 HD 46966
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
photom.dat 25 2477 H{alpha}, uvby and UBV photometry
polar.dat 45 72 Blue, green and red polarimetry
vrad.dat 33 34 Star 2 (hot component of AX Mon) radial velocities
ecoa656.dat 31 857 Spec. (638-672 nm), 1993/12/28, ECO (1)
ecob448.dat 31 855 Spec. (439-456 nm), 1994/01/01, ECO (1)
ecob777.dat 31 663 Spec. (769-796 nm), 1994/01/01, ECO (1)
ecoc594.dat 31 838 Spec. (577-610 nm), 1994/01/03, ECO (1)
jpaa545.dat 31 1148 Spec. (541-548 nm), 1993/11/18, JPA (2)
jpaa558.dat 31 1149 Spec. (555-561 nm), 1993/11/18, JPA (2)
jpaa573.dat 31 1149 Spec. (569-576 nm), 1993/11/18, JPA (2)
jpaa587.dat 31 1149 Spec. (584-591 nm), 1993/11/18, JPA (2)
jpaa604.dat 31 1149 Spec. (600-607 nm), 1993/11/18, JPA (2)
jpaa620.dat 31 1148 Spec. (616-623 nm), 1993/11/18, JPA (2)
jpaa638.dat 31 1148 Spec. (634-641 nm), 1993/11/18, JPA (2)
jpaa656.dat 31 1148 Spec. (653-660 nm), 1993/11/18, JPA (2)
jpaa677.dat 31 1149 Spec. (673-680 nm), 1993/11/18, JPA (2)
jpab545.dat 31 1148 Spec. (541-548 nm), 1993/12/01, JPA (2)
jpab558.dat 31 1148 Spec. (555-561 nm), 1993/12/01, JPA (2)
jpab573.dat 31 1148 Spec. (569-576 nm), 1993/12/01, JPA (2)
jpab587.dat 31 1148 Spec. (584-591 nm), 1993/12/01, JPA (2)
jpab604.dat 31 1148 Spec. (600-607 nm), 1993/12/01, JPA (2)
jpab620.dat 31 1148 Spec. (616-623 nm), 1993/12/01, JPA (2)
jpab638.dat 31 1149 Spec. (634-641 nm), 1993/12/01, JPA (2)
jpab656.dat 31 1148 Spec. (653-660 nm), 1993/12/01, JPA (2)
jpab677.dat 31 1148 Spec. (673-680 nm), 1993/12/01, JPA (2)
jpac545.dat 31 1149 Spec. (541-548 nm), 1993/02/27, JPA (2)
jpac558.dat 31 1148 Spec. (555-561 nm), 1993/02/27, JPA (2)
jpac573.dat 31 1149 Spec. (569-576 nm), 1993/02/27, JPA (2)
jpac587.dat 31 1149 Spec. (584-591 nm), 1993/02/27, JPA (2)
jpac604.dat 31 1149 Spec. (600-607 nm), 1993/02/27, JPA (2)
jpac620.dat 31 1148 Spec. (616-623 nm), 1993/02/27, JPA (2)
jpac638.dat 31 1149 Spec. (634-641 nm), 1993/02/27, JPA (2)
jpac656.dat 31 1149 Spec. (653-660 nm), 1993/02/27, JPA (2)
jpac677.dat 31 1149 Spec. (673-680 nm), 1993/02/27, JPA (2)
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Note (1): Spectra obtained at the Mount Laguna Observatory by E.C. Olson, ECO
Note (2): Spectra obtained at the Ritter Observatory by J.P. Aufdenberg, JPA
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Byte-by-byte Description of file: photom.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Band Photometric band (1)
4- 16 F13.5 d HJD Heliocentric Julian Date
19- 25 F7.4 mag dMag Magnitude difference (2)
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Note (1): hn: H{alpha} narrow photometry
hw: H{alpha} wide photometry
u: Stromgren u photometry
b: Stromgren b photometry
v: Stromgren v photometry
y: Stromgren y photometry
U: Johnson U photometry
B: Johnson B photometry
V: Johnson V photometry
Note (2): Magnitude difference in the sense variable minus comparison.
The comparison star was HD 46966 (BD +06 1301).
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Byte-by-byte Description of file: polar.dat
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Bytes Format Units Label Explanations
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1 A1 --- Band [bgr] Polarimetry band (1)
3- 13 F11.3 d HJD Heliocentric Julian Date
15- 18 F4.2 --- q Stokes q value (2)
20- 23 F4.2 --- e_q Error in q
25- 29 F5.2 --- u Stokes u value (2)
31- 34 F4.2 --- e_u Error in u
36- 40 F5.2 --- v ? Stokes v value
42- 45 F4.2 --- e_v ? Error in v
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Note (1): b: blue
g: green
r: red
Note (2): q = P_l_cos2{theta} and u=P_l_in2{theta}
where P_l_ is the linear polarisation and
{theta} the linear polarisation electric vector
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Byte-by-byte Description of file: vrad.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d HJD Heliocentric Julian Date
16- 21 F6.2 km/s vsini Star 2 radial velocity
24- 29 F6.3 --- RW *Relative weight (1)
33 I1 --- Obs *Observer (2)
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Note (1): For Cowley and Mastenova, the weights are based on the variances
of the individual data sets, and for the authors' data they are
based on the cross-correlation fit variances.
Note (2): 1 = Cowley A.P., 1964ApJ...139..817C
2 = Mastenova K., 1989BAICz..40..118M
3 = Aufdenberg J.P., this work
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Byte-by-byte Description of file: eco*.dat
Byte-by-byte Description of file: jpa*.dat
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Bytes Format Units Label Explanations
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1- 8 A8 "DD/MM/YY" Date Observation date
10- 17 F8.4 nm Lambda Wavelength
22- 31 E10.4 --- Flux Flux normalized to estimated continuum
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Origin: AAS CD-ROM series, Volume 9, 1997 Lee E. Brotzman [ADS] 24-Jul-97
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(End) Patricia Bauer [CDS] 05-Feb-1998