J/ApJ/733/L8 Optical and IR photometry of [KOS94] HA11 (Kun+, 2011)
A peculiar young eruptive star in the dark cloud Lynds 1340.
Kun M., Szegedi-Elek E., Moor A., Abraham P., Acosta-Pulido J.A., Apai D.,
Kelemen J., Pal A., Racz M., Regaly ZS., Szakats R., Szalai N., Szing A.
<Astrophys. J., 733, L8 (2011)>
=2011ApJ...733L...8K 2011ApJ...733L...8K
ADC_Keywords: Stars, variable ; Photometry, infrared ; Photometry, VRI
Keywords: stars: formation - stars: individual ([KOS94] HA11) -
stars: pre-main sequence - stars: variables: T Tauri, Herbig Ae/Be
Abstract:
We conducted a long-term optical photometric and spectroscopic
monitoring of the strongly variable, accreting young sun-like star
[KOS94] HA11, associated with the dark cloud Lynds 1340 that exhibited
large amplitude (5-6mag in the IC band) brightness variations on 2-3
years timescales, flat spectral energy distribution (SED), and
extremely strong (300≲EW/Å≲900) Hα emission. In this Letter
we describe the basic properties of the star, derived from our
observations between 1999 and 2011, and put into context the observed
phenomena. The observed variations in the emission spectra,
near-infrared colors, and SED suggest that [KOS94] HA11 (spectral
type: K7-M0) is an eruptive young star, possibly similar in nature to
V1647 Ori: its large-scale photometric variations are governed by
variable accretion rate, associated with variations in the inner disk
structure. The star recently has undergone strong and rapid brightness
variations, thus its further observations may offer a rare opportunity
for studying structural and chemical rearrangements of the inner disk,
induced by variable central luminosity.
Description:
Photometric observations in the VRCIC bands spanning the time
interval between 1999 October and 2011 February were performed with
several instruments and telescopes. Most of the data were obtained
with the 60/90/180cm Schmidt telescope of the Konkoly Observatory and
with the 1m RCC telescope of the Konkoly Observatory. Further
photometric observations were performed with the 50cm Cassegrain
telescope of the Konkoly Observatory, the IAC-80 telescope of the
Teide Observatory (Spain), and with the CAFOS instrument installed on
the 2.2m telescope of the Calar Alto Observatory (Spain).
JHKs imaging observations of [KOS94] HA11 were performed on 2007
October 1, using the infrared camera NOTCam, installed on the Nordic
Optical Telescope, on 2009 October 12 using NICFPS on the ARC 3.5m
telescope, and on 2010 October 18 with MAGIC installed on the 2.2m
telescope of Calar Alto Observatory.
Moreover, we conducted a monitoring of [KOS94] HA11 with Spitzer/IRAC
during the post-helium phase between 2009 October 24 and November 7
(Prog. ID: 60167, PI: P. Abraham).
Objects:
------------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------------
02 33 01.2 +72 43 29 [KOS94] HA11 = [KOS94] HA 11
------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 54 315 Optical, near- and mid-IR photometric observations
of [KOS94] HA 11 between 1999 and 2011 March
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 "YYYY/MM/DD" Date Date of the observation
12- 17 F6.1 d JD Modified Julian date; JD-2450000
19- 22 A4 --- Band Name or central wavelength in microns of
photometric band (J H Ks, V Rc Ic or 3.6
4.5 5.8 8.0 and 24.0)
24- 28 F5.2 mag mag Measured magnitude in Band
30- 33 F4.2 mag e_mag Error of the mag
35- 54 A20 --- Inst Telescope/instrument or data base for mag
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 16-Nov-2012