J/ApJ/795/L26 Candidate eruptive young stars in Lynds 1340 (Kun+, 2014)
New candidate eruptive young stars in Lynds 1340.
Kun M., Apai D., O'Linger-Luscusk J., Moor A., Stecklum B.,
Szegedi-Elek E., Wolf-Chase G.
<Astrophys. J., 795, L26 (2014)>
=2014ApJ...795L..26K 2014ApJ...795L..26K (SIMBAD/NED BibCode)
ADC_Keywords: YSOs ; Photometry, UBVRI ; Photometry, infrared
Keywords: stars: individual: (IRAS 02224+7227, 2MASS J02263797+7304575,
2MASS J02325605+7246055); stars: pre-main sequence; stars: protostars;
stars: variables: T Tauri, Herbig Ae/Be
Abstract:
We report on the discovery of three candidate eruptive young stars,
found during our comprehensive multi-wavelength study of the young
stellar population of the dark cloud L1340. These stars are as
follows. (1) IRAS 02224+7227 (2MASS 02270555+7241167, HH 487S)
exhibited FUor-like spectrum in our low-resolution optical spectra.
The available photometric data restrict its luminosity to
23L☉<Lbol<59L☉. (2) 2MASS 02263797+7304575, identified
as a classical T Tauri star during our Hα survey, exhibited an
EXor-type brightening in 2005 November at the time of the Sloan
Digital Sky Survey observations of the region. (3)
2MASSJ02325605+7246055, a low-mass embedded young star, associated
with a fan-shaped infrared nebula, underwent an outburst between the
DSS 1 and DSS 2 surveys, leading to the appearance of a faint optical
nebula. Our [SII] and Hα images, as well as the Spitzer Infrared
Array Camera 4.5µm images, revealed Herbig-Haro objects associated
with this star. Our results suggest that amplitudes and timescales of
outbursts do not necessarily correlate with the evolutionary stage of
the stars.
Description:
Lynds 1340 was observed by the Spitzer Space Telescope using the
Infrared Array Camera (IRAC) on 2009 March 16 and the Multiband
Imaging Photometer (MIPS) for Spitzer on 2008 November 26 (Prog. ID:
50691, PI: G. Fazio). The observations covered ∼1deg2 in each band.
We obtained low-resolution optical spectra for the star coinciding
with IRAS 02224+7227 on 2003 February 5 using CAFOS with the G-100
grism on the 2.2m Telescope of the Calar Alto Observatory, and on 2004
December 11 using FAST on the 1.5m FLWO Telescope.
High angular resolution JHK images, centered on the same star, were
obtained on 2002 October 24 using the near-infrared camera Omega-Cass,
mounted on the 3.5m Telescope of the Calar Alto Observatory.
We performed a new search for Hα emission stars in L1340 using
the Wide Field Grism Spectrograph 2 installed on the University of
Hawaii 2.2m Telescope. We observed 2MASS J02263797+7304575 on 2011
October 16 and detected a Hα emission with EW(Hα)=-80Å
in its spectrum.
The Ks magnitude of 2MASS J02325605+7246055 was measured on the images
obtained on 2010 October 18, during the monitoring program of V1180
Cas (Kun et al. 2011, J/ApJ/733/L8), using the MAGIC camera on the
2.2m Telescope of the Calar Alto Observatory.
Narrow-band images through [SII] and Hα filters, as well as
broad R-band images containing the environment of
2MASSJ02325605+7246055, were obtained with the Schmidt Telescope of
the Thuringer Landessternwarte (TLS), Tautenburg in 2011 May, June,
and September. Spectra of the nebula and the two brightest HH knots
were obtained using the TLS medium-resolution Nasmyth spectrograph
(R∼700) in 2011 November.
BVRCIC photometric observations of IRAS 02224+7227 were performed
with the 1m Ritchey-Chretien-Coude (RCC) Telescope of the Konkoly
Observatory at three epochs between 2001 and 2011. We measured the
RC and IC magnitudes of IRAS 02224+7227 and 2MASSJ02263797+7304575
at several epochs between 2011 January and 2014 June on the images
collected with the wide-field camera on the Schmidt Telescope of the
Konkoly Observatory to monitor the light variations of V1180 Cas (Kun
et al. 2011, J/ApJ/733/L8).
L1340 is situated within Stripe 1260 of the SEGUE survey (Yanny et al.
2009, J/AJ/137/4377), thus its entire area was observed in the ugriz
bands in 2005 November-December. Each target star has high-quality
3.4, 4.6, 12, and 22um fluxes in the AllWISE data base.
Objects:
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RA (ICRS) DE Designation(s)
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02 26 37.97 +73 04 57.6 2MASS-1 = 2MASS J02263797+7304575
02 27 05.58 +72 41 16.5 IRAS = IRAS 02224+7227
02 32 56.06 +72 46 05.5 2MASS-2 = 2MASS J02325605+7246055
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 77 71 Photometric data of the target stars
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See also:
II/328 : AllWISE Data Release (Cutri+ 2013)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/ApJS/224/22 : The YSO population of LDN 1340 in infrared (Kun+, 2016)
J/MNRAS/458/3479 : SVM selection of WISE YSO Candidates (Marton+, 2016)
J/ApJS/208/28 : Hα survey in the ONC (Szegedi-Elek+, 2013)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/A+A/551/A62 : V2492 Cyg light variations (Kospal+, 2013)
J/MNRAS/413/2689 : PV Cep V(RI)c and IRAC photometry (Kun+, 2011)
J/ApJ/733/L8 : Optical and IR photometry of [KOS94] HA11 (Kun+, 2011)
J/A+A/507/881 : Emission lines in EX Lup optical spectrum (Sipos+, 2009)
J/ApJ/704/606 : Protostars in the Vela Molecular Cloud (Giannini+, 2009)
J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)
J/ApJS/179/249 : Low-luminosity embedded protostar population (Dunham+, 2008)
J/PASP/119/994 : MIPS 24um calibrators (Engelbracht+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "Y/M/D" Date Date of the observation
12- 16 A5 --- Band Photometric band used in the observation
(BVICRC, JHKs, [3.6][4.5][5.8][8.0], [24][70])
18- 23 F6.3 mag 2MASS-1 [3.3/18.1]? 2MASS J02263797+7304575 magnitude
in Band
25- 29 F5.3 mag e_2MASS-1 [0.01/1]? Error in 2MASS-1
31- 36 F6.3 mag IRAS [3.9/14.7]? IRAS 02224+7227 magnitude in Band,
38- 42 F5.3 mag e_IRAS [0.02/0.2]? Error in IRAS
44- 49 F6.3 mag 2MASS-2 [-0.1/15.2]? 2MASS J02325605+7246055 magnitude
in Band
51- 55 F5.3 mag e_2MASS-2 [0.03/0.2]? Error in 2MASS-2
57- 77 A21 --- T/I Telescope/instrument or database used
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 29-Jul-2016