J/AN/345/30118 RW Aur spectroscopy and photometry (Lux+, 2024)
The deep eclipses of RW Aur revisited by long-term photometric and
spectroscopic monitoring.
Lux O., Mugrauer M., Bischoff R.
<Astron. Nachr. 345, e230118 (2024)>
=2024AN....34530118L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, emission ; Photometry, UBVRI ;
Spectroscopy
Keywords: techniques: photometric, spectroscopic -
stars: variables: T Tauri stars - stars: individual RW Aur
Abstract:
RW Aurigae is a young stellar system containing a classical T Tauri
star as the primary component. It shows deep, irregular dimmings,
first detected in 2010. At the University Observatory Jena, we carried
out optical follow-up observations. We performed multiband (BVRI)
photometry of the system with the Cassegrain-Teleskop-Kamera II and
the Schmidt-Teleskop-Kamera between September 2016 and April 2019, as
well as spectroscopy, using the Fibre Linked ECHelle Astronomical
Spectrograph between September 2016 and April 2018. We present the
apparent photometry of RW Aur, which is consistent with and
complementary to photometric data from the American Association of
Variable Star Observers. The V-band magnitude of RW Aur changed by up
to three magnitudes during the timespan of our monitoring campaign.
For the observing epochs 2016/2017 and 2017/2018 we report a
decreasing brightness, while in the epoch 2018/2019 the system
remained in a relatively constant bright state. In the color-magnitude
diagram, we see that RW Aur lies close to a track for grey extinction.
The spectra show a decreasing equivalent width of the Hα
emission line for decreasing brightness, whereas the equivalent width
of the [OI] line increases, indicating an increased outflow activity
during the obscuration. Both gives further evidence for the favored
theory that the obscurations are caused by a hot dusty wind emerging
from the inner disk.
Description:
The fully reduced FLECHAS spectra and the BVRI band photometry
of RW Aur.
Observations of RW Aur were taken between 31 August 2016 and 21 April
2019 with instruments operated at the University Observatory Jena,
which is located near the small village Grosschwabhausen about 10km
west of Jena.
The photometry of the target was monitored in 29 nights with the
Cassegrain-Teleskop-Kamera II (CTK-II) and in 68 nights with the
Schmidt-Teleskop-Kamera (STK). In addition, we could obtain
spectroscopic observations of RW Aur in 11 nights with the Fibre
Linked ECHelle Astronomical Spectrograph (FLECHAS).
Objects:
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RA (2000) DE Designation(s)
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05 07 49.56 +30 24 05.1 RW Aur = HD 240764
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 40 11 FLECHAS observing log
table2.dat 63 97 Photometric data
fits/* . 11 Individual fits spectra
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See also:
J/A+A/440/595 : RW Aur spectra (Alencar+, 2005)
J/AJ/146/112 : V light curve of RW Aur (Rodriguez+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d JD Julian date of the observation
13- 16 I4 s DIT Detector integration time
18 I1 --- NDIT Number of detector integrations
20- 22 I3 --- SNR Signal-to-noise-ratio at the peak of the
Hα emission line
24- 26 F3.1 --- X Average airmass during the observation
28- 40 A13 --- FileName Name of fits file in subdirectory fits
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 F11.3 d JD Julian date of the observation
13- 18 F6.3 mag Bmag ? B-band magnitude
20- 24 F5.3 mag e_Bmag ? B-band magnitude uncertainty
26- 31 F6.3 mag Vmag ? V-band magnitude
33- 37 F5.3 mag e_Vmag ? V-band magnitude uncertainty
39- 44 F6.3 mag Rmag ? R-band magnitude
46- 50 F5.3 mag e_Rmag ? R-band magnitude uncertainty
52- 57 F6.3 mag Imag ? I-band magnitude
59- 63 F5.3 mag e_Imag ? I-band magnitude uncertainty
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Acknowledgements:
Markus Mugrauer, markus(at)astro.uni-jena.de
(End) Markus Mugrauer [AIU Jena], Patricia Vannier [CDS] 23-Jan-2024