2024MNRAS.532.2683L

Query : 2024MNRAS.532.2683L

2024MNRAS.532.2683L - Mon. Not. R. Astron. Soc., 532, 2683-2704 (2024/August-1)

A population of mid-infrared large-amplitude variable young stellar objects from unTimely.

LI J. and WANG T.

Abstract (from CDS):

Utilizing a decade-long unTimely data set, supplemented by multiband data from archives, we search for young stellar objects (YSOs) with variations larger than one magnitude in W1 band within a region of 110 square degrees in the Galactic plane, covered by VISTA Variables in the Via Lactea. A total of 641 candidate YSOs have been identified. We classified them into bursts, dips, faders, seculars, and irregulars. Within the burst category, 18 sources were identified as FUor candidates and 1 as an EXor candidate. Irregulars are the most prevalent in the sample. In both bursts and faders, the redder sources tend to show a pattern of bluer when brighter, whereas the bluer sources display the opposite trend, possibly related to the accretion structure of YSOs at different stages. Finally, we obtained the recurrence time-scale for FUor eruptions at various stages of YSO evolution. Our findings indicate that younger YSOs generally experience more frequent eruptions compared to older ones.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): stars: AGB and post-AGB - stars: pre-main-sequence - stars: variables: T Tauri, Herbig Ae/Be - infrared: stars

Status at CDS : Examining the need for a new acronym. // Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* AA Tau Or* 04 34 55.4201902392 +24 28 53.033624580 13.14 13.34 12.20 12.03   K5Ve 801 0
2 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
3 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 623 0
4 HOPS 383 Y*O 05 35 29.8407 -04 59 51.006           ~ 71 0
5 NGC 2264 OpC 06 40 53.7 +09 52 32           ~ 1876 0
6 SPICY 11492 Or* 11 43 09.517 -62 21 13.34           ~ 3 0
7 SPICY 13749 Or* 12 34 24.74568 -61 57 42.8076           ~ 3 0
8 SPICY 15009 Or* 12 54 01.310 -62 15 09.73           ~ 2 0
9 2MASS J12574420-6215063 Or* 12 57 44.1760757424 -62 15 06.338907612           ~ 4 0
10 SPICY 15926 Or* 13 07 53.458 -62 28 38.59           ~ 2 0
11 2MASS J13255029-6204468 Or* 13 25 50.29656 -62 04 46.8120           ~ 2 0
12 SPICY 18283 Or* 13 39 19.904 -62 20 01.25           ~ 2 0
13 2MASS J13530261-6125338 Or* 13 53 02.61552 -61 25 33.8304           ~ 2 0
14 SPICY 21665 Or* 14 16 17.972 -61 22 22.67           ~ 2 0
15 SPICY 23358 Or* 14 43 04.39632 -59 51 36.5868           ~ 3 0
16 SPICY 24582 Or* 14 56 19.460 -58 19 44.00           ~ 2 0
17 2MASS J15511402-5327495 Or* 15 51 14.02872 -53 27 49.5792           ~ 2 0
18 SPICY 36590 Or* 16 23 27.121 -49 44 43.62           ~ 5 0
19 2MASS J16381440-4733355 Or* 16 38 14.405 -47 33 35.52           ~ 3 0
20 2MASS J16394877-4548480 Or* 16 39 48.771 -45 48 48.02           ~ 9 0
21 2MASS J16434470-4645386 Or* 16 43 44.7167306136 -46 45 38.619972504           ~ 4 0
22 SSTGLMA G340.7714-00.1196 Or* 16 50 18.059 -44 43 58.59           ~ 1 0
23 NAME VVV-WIT-13 Or* 16 53 44.38344 -43 28 19.4772           ~ 6 0
24 WISE J165805.73-432745.7 Or* 16 58 05.73086 -43 27 45.7466           ~ 1 0
25 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1195 1
26 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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