J/ApJ/890/86 Hα spectra & V-band photometry of δ Sco (Suffak+, 2020)
The large-scale behavior in the disk of δ Scorpii from 2000 to 2018.
Suffak M.W., Jones C.E., Tycner C., Henry G.W., Carciofi A.C., Mota B.C.,
Rubio A.C.
<Astrophys. J., 890, 86 (2020)>
=2020ApJ...890...86S 2020ApJ...890...86S
ADC_Keywords: Stars, Be; Stars, double and multiple; Spectra, optical;
Equivalent widths; Photometry, UBV
Keywords: Be stars ; Binary stars ; Stellar spectral lines ; Spectroscopy ;
Photometry ; Circumstellar disks
Abstract:
We model the circumstellar disk of δ Sco using the
three-dimensional Monte Carlo radiative transfer code HDUST in order
to quantify the large-scale changes in the disk through the years
2000-2018, and to see if these changes can be attributed to the
secondary star affecting the disk throughout its orbit. We determine
our best-fitting models through matching simulated observations to
actual Hα spectroscopy and V-band photometric observations. Our
modeling results confirm previous findings that the disk of δSco
was forming early in the century. We also find a period of disk
dissipation when the companion is at apastron, as well as a
significant growth of the disk between 2009 and 2011, prior to the
periastron of 2011. Due to the steady-state nature of the disk after
2011, it is difficult to say whether the variations seen are due to
the effect of the close passage of the binary companion.
Description:
The Ritter Observatory in Toledo, Ohio, USA, observed δ Sco
using a 1m telescope coupled with an echelle spectrograph and a Wright
Instruments Ltd. CCD camera during the 2000 to 2003 time period. These
observations have a resolution of R=26000 and cover the wavelength
region 5285 to 6600Å. We retrieved some of these spectra from the
Ritter Observatory Public Archive, as well as the EW data from
Miroshnichenko+ (2003, J/A+A/408/305) where the observations were
originally published.
Hα spectra were also obtained from the Canada-France-Hawaii
Telescope (CFHT) Science Archive via the Canadian Astronomy Data
Centre (CADC). The CFHT (in Maunakea, Hawaii) collected Hα
spectra of δ Sco in the years 2007, 2010, 2011, 2016, and 2017,
through use of their Echelle Spectropolarimetric Device for the
Observation of Stars at CFHT (ESPaDOnS). This instrument has a
resolving power of R=65000.
Additional Hα spectra were obtained using the fiber-fed echelle
spectrograph attached to the 1.1m John S. Hall telescope at the Lowell
Observatory in Flagstaff, Arizona. We have 101 spectra from 2005 to
2018 that were taken with this instrument at a resolving power of R=10000.
Photometry for δ Sco was collected and used by
Carciofi+ (2006ApJ...652.1617C 2006ApJ...652.1617C).
These observations were taken in 2002 to 2005 at the Tien-Shan
Observatory in Kazakhstan with a 50cm telescope. Here we used their
V-band data.
The American Association of Variable Star Observers (AAVSO) also has
many photometric measurements. We collected the V-band measurements
for δ Sco in the AAVSO International Database, which spans the
years 2000-2009. We selected only the data that had the "verified"
flag attached to it, to ensure the photometry was of good quality.
Over a thousand V-band observations of δ Sco were acquired using
the T3 0.4m automatic photoelectric telescope (APT) at Fairborn
Observatory in southern Arizona over the period of 2009-2019 in
Johnson B and V filters.
Objects:
---------------------------------------------------------
RA (ICRS) DE Designation(s)
---------------------------------------------------------
16 00 20.01 -22 37 18.1 * del Sco = TYC 6779-2194-1
---------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 33 51712 Hα observations for δ Sco
from the Lowell Observatory
table2.dat 22 595 Hα EW data for δ Sco
table3.dat 22 1714 V-band data for delta Sco
--------------------------------------------------------------------------------
See also:
J/A+A/408/305 : Spectroscopic obs. of delta Sco (Miroshnichenko+, 2003)
J/ApJ/729/L5 : The revised orbit of the δ Sco system (Tycner+, 2011)
J/ApJ/757/29 : Astrometric measurements of HD 143275 (Che+, 2012)
J/A+A/537/A146 : Stellar models with rotation. Z=0.014 (Ekstrom+, 2012)
J/A+A/558/A103 : Stellar models with rotation. Z=0.002 (Georgy+, 2013)
J/AJ/145/142 : Differential BV photometry of δ Sco (Jones+, 2013)
J/ApJ/766/119 : Radial velocities of δ Sco (Miroshnichenko+, 2013)
J/ApJ/843/24 : Hα interferometry obs. of 48 Per (Jones+, 2017)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- ID [1/101] Spectrum Number
5- 13 F9.3 d MJD [53461.4/58296.3] Modified Julian Date
of observation
15- 24 F10.6 nm lambda [648.18/659.81] Wavelength
26- 33 F8.6 --- F/Fc [0.001/7.3] Flux over continuum flux
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.3 --- MJD [51777/58296.3] Modified Julian Date
11- 15 F5.2 nm EWHa [-2.92/-0.33] H alpha Equivalent Width
17- 22 A6 --- Source Source of observation (1)
--------------------------------------------------------------------------------
Note (1): Source as follows:
CFHT = The Canada-France-Hawaii Telescope (in Maunakea, Hawaii) with the
Echelle Spectropolarimetric Device for the Observation of Stars
(ESPaDOnS) via the Canadian Astronomy Data Centre (CADC) Science
Archive (390 occurrences)
Lowell = The fiber-fed echelle spectrograph attached to the 1.1m John S. Hall
telescope at the Lowell Observatory in Flagstaff, Arizona
(101 occurrences)
Ritter = The echelle spectrograph on the 1m telescope at Ritter Observatory
in Toledo, Ohio, USA (104 occurrences)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.2 --- MJD [51758.8/58656.8] Modified Julian Date
10- 13 F4.2 mag Vmag [1.6/2.6] V-band magnitude
15- 22 A8 --- Source Source of observation (1)
--------------------------------------------------------------------------------
Note (1): Source as follows:
Fairborn = the T3 0.4m automatic photoelectric telescope (APT) at
Fairborn Observatory in southern Arizona (1181 occurrences)
AAVSO = The American Association of Variable Star Observers (AAVSO)
International Database (518 occurrences)
C06 = Carciofi+ 2006ApJ...652.1617C 2006ApJ...652.1617C -- These observations were taken
at the Tien-Shan Observatory in Kazakhstan with a 50cm
telescope (15 occurrences)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 07-Oct-2021