J/ApJ/936/64 Photometric light curve of V1515 Cyg (Szabo+, 2022)
A Multi-epoch, Multiwavelength Study of the Classical FUor V1515 Cyg Approaching
Quiescence.
Szabo Z.M., Kospal A., Abraham P., Park S., Siwak M., Green J.D., Pal A.,
Acosta-Pulido J.A., Lee J.-E., Ibrahimov M., Grankin K., Kovacs B.,
Bora Z., Bodi A., Cseh B., Csornyei G., Drozdz M., Hanyecz O., Ignacz B.,
Kalup C., Konyves-Toth R., Krezinger M., Kriskovics L., Ogloza W.,
Ordasi A., Sarneczky K., Seli B., Szakats R., Sodor A., Szing A., Vida K.,
Vinko J.
<Astrophys. J., 936, 64 (2022)>
=2022ApJ...936...64S 2022ApJ...936...64S
ADC_Keywords: YSOs; Photometry, UVBGRI
Keywords: Young stellar objects ; FU Orionis stars ; Circumstellar disks
; Photometry ; Spectroscopy ; Infrared astronomy ; Optical
astronomy
Abstract:
Historically, FU Orionis-type stars are low-mass, pre-main-sequence
stars. The members of this class experience powerful accretion
outbursts and remain in an enhanced accretion state for decades or
centuries. V1515Cyg, a classical FUor, started brightening in the
1940s and reached its peak brightness in the late 1970s. Following a
sudden decrease in brightness, it stayed in a minimum state for a few
months, then started brightening for several years. We present the
results of our ground-based photometric monitoring complemented with
optical/near-infrared spectroscopic monitoring. Our light curves show
a long- term fading with strong variability on weekly and monthly
timescales. The optical spectra show PCygni profiles and broad
blueshifted absorption lines, common properties of FUors. However,
V1515Cyg lacks the PCygni profile in the CaII 8498Å line, a part of
the Ca infrared triplet, formed by an outflowing wind, suggesting that
the absorbing gas in the wind is optically thin. The newly obtained
near-infrared spectrum shows the strengthening of the CO bandhead and
the FeH molecular band, indicating that the disk has become cooler
since the last spectroscopic observation in 2015. The current
luminosity of the accretion disk dropped from the peak value of
138L☉ to about 45L☉, suggesting that the long-term fading is
also partly caused by the dropping of the accretion rate.
Description:
The bulk of photometric observations was obtained at Piszkesteto
Observatory between 2005 and 2021 in the B, V, RC, IC, g',r', and i'
filters. Three telescopes, each having a somewhat different optical
system, were used. Between 2005 October and 2011 May we observed the
star with the 1m Ritchey-Chretien-Coude (RCC) telescope,
equipped with a 1300x1340 pixel Roper Scientific VersArray: 1300B CCD
camera (pixel scale: 0.306"). From 2011 August-2019 December we
observed the star with the 60/90cm Schmidt telescope (pixel scale:
1.027") and from 2020 May we used the Astro Systeme Austria AZ800
alt-azimuth direct drive 80cm Ritchey-Chretien (RC80) telescope
(pixel scale 0.55").
Objects:
----------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------
20 23 48.01 +42 12 25.7 V1515 Cyg = HBC 692
----------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 67 1504 New Optical and near-IR photometry of V1515 Cyg
fig1.dat 66 2769 Photometric light curve of V1515 Cyg
--------------------------------------------------------------------------------
See also:
J/A+AS/101/59 : 1-20um observations of Herbig-Haro objects (Molinari+ 1993)
J/AJ/118/1043 : Herbig Ae/Be stars catalog (Herbst+, 1999)
J/AJ/147/140 : SED of 24 class I & class II FU Orionis stars (Gramajo+, 2014)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/ApJS/219/33 : BANYAN. VII. Candidate YMG members from BASS (Gagne+, 2015)
J/A+A/600/A20 : Lupus YSOs X-shooter spectroscopy (Alcala+, 2017)
J/A+A/607/A39 : 7 FU Orionis-type stars CO spectral cubes (Feher+, 2017)
J/A+A/618/A79 : FU Orionis small-amplitude light variations (Siwak+, 2018)
J/ApJ/874/82 : Follow-up photometry & spectro of PTF14jg (Hillenbrand+, 2019)
J/A+A/625/A49 : Dimming event of RW Aurigae A (Koutoulaki+, 2019)
J/ApJ/878/134 : HARPS & X-shooter spectra Southern M dwarfs (Kuznetsov+ 2019)
J/A+A/644/A135 : V646Pup TESS and ground photometry and spectrum (Siwak+, 2020)
J/ApJ/917/80 : Opt-to-IR monitoring obs. of V1057 Cyg (Szabo+, 2021)
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Instr Instrument
11- 14 A4 --- Filt Filter
16- 31 F16.8 d JD [2453652/2459727] Julian Date of Observation
33- 40 F8.5 mag omag [7.51/16.4] Observed magnitude in Filter
42- 53 F12.10 mag e_omag [7e-05/0.07] Uncertainty in omag (1)
55- 67 F13.9 mag err2 [0.0001/0.2]? other uncertainty quoted
--------------------------------------------------------------------------------
Note (1): e_omag was used in the figures
--------------------------------------------------------------------------------
Byte-by-byte Description of file: fig1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Instr Instrument/Source (1)
17- 17 A1 --- Filt Filter
19- 42 F24.16 d JD [2416387/2459330] Julian Date of Observation
44- 53 F10.7 mag omag [1.26,17.8] Observed magnitude in Filter
55- 66 F12.10 mag e_omag [0.01/4.04] Uncertainty in omag
--------------------------------------------------------------------------------
Note (1): Instrument/Sources used as follows:
Wesleyan = Herbst & Shevchenko, 1999, J/AJ/118/1043
Kolotilov1983 = Kolotilov 1983PAZh....9..622K 1983PAZh....9..622K
IOMC data = http://sdc.cab.inta-csic.es/omc/index.jsp
ZTF = Masci+, 2019PASP..131a8003M 2019PASP..131a8003M
ZTF DR6 = http://irsa.ipac.caltech.edu/Missions/ztf.html
Landolt1977 = Landolt, 1977PASP...89..704L 1977PASP...89..704L
Kenyon1991 = Kenyon, Hartmann, and Kolotilov 1991PASP..103.1069K 1991PASP..103.1069K
Herbig1977 = Herbig 1977ApJ...217..693H 1977ApJ...217..693H
DASCH = Grindlay+, 2012IAUS..285...29G 2012IAUS..285...29G
DASCH_1944-1947 = http://dasch.rc.fas.harvard.edu/lightcurve.php
DASCH_1949-1953 = http://dasch.rc.fas.harvard.edu/lightcurve.php
DASCH_1962 = http://dasch.rc.fas.harvard.edu/lightcurve.php
DASCH_1964-1974 = http://dasch.rc.fas.harvard.edu/lightcurve.php
DASCH_1975-1980 = http://dasch.rc.fas.harvard.edu/lightcurve.php
DASCH_1981-1989 = http://dasch.rc.fas.harvard.edu/lightcurve.php
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 19-Jun-2024