Herbert, Carys, Froebrich, Dirk, Vanaverbeke, Siegfried, Scholz, Aleks, Eislöffel, Jochen, Urtly, Thomas, Walton, Ivan L, Wiersema, Klaas, Quinn, Nick J, Piehler, Georg, and others. (2024) A survey for variable young stars with small telescopes: IX - Evolution of spot properties on YSOs in IC 5070. Monthly Notices of the Royal Astronomical Society, 529 (4). pp. 4856-4878. ISSN 0035-8711. E-ISSN 1365-2966. (doi:10.1093/mnras/stae812) (KAR id:105506)
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| Official URL: https://doi.org/10.1093/mnras/stae812 |
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Abstract
We present spot properties on 32 periodic young stellar objects in IC 5070. Long term, ∼5 yr, light curves in the V, R, and I-bands are obtained through the HOYS (Hunting Outbursting Young Stars) citizen science project. These are dissected into six months long slices, with 3 months oversampling, to measure 234 sets of amplitudes in all filters. We fit 180 of these with reliable spot solutions. Two thirds of spot solutions are cold spots, the lowest is 2150 K below the stellar temperature. One third are warm spots that are above the stellar temperature by less than ∼2000 K. Cold and warm spots have maximum surface coverage values of 40 per cent, although only 16 per cent of warm spots are above 20 per cent surface coverage as opposed to 60 per cent of the cold spots. Warm spots are most likely caused by a combination of plages and low density accretion columns, most common on objects without inner disc excess emission in K − W2. Five small hot spot solutions have <3 percent coverage and are 3000 – 5000 K above the stellar temperature. These are attributed to accretion, and four of them occur on the same object. The majority of our objects are likely to be accreting. However, we observe very few accretion hot spots as either the accretion is not stable on our timescale or the photometry is dominated by other features. We do not identify cyclical spot behaviour on the targets. We additionally identify and discuss a number of objects that have interesting amplitudes, phase changes, or spot properties.
| Item Type: | Article |
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| DOI/Identification number: | 10.1093/mnras/stae812 |
| Uncontrolled keywords: | stars; formation; stars: pre-main-sequence; stars: star spots; stars: variables; T Tauri; stars: rotation |
| Subjects: | Q Science |
| Divisions: | Divisions > Division of Natural Sciences > Physics and Astronomy |
| Funders: | Science and Technology Facilities Council (https://ror.org/057g20z61) |
| SWORD Depositor: | JISC Publications Router |
| Depositing User: | JISC Publications Router |
| Date Deposited: | 02 Apr 2024 11:24 UTC |
| Last Modified: | 22 Apr 2024 15:07 UTC |
| Resource URI: | https://kar.kent.ac.uk/id/eprint/105506 (The current URI for this page, for reference purposes) |
University of Kent Author Information
Herbert, Carys.
| Creator's ORCID: |
 https://orcid.org/0000-0003-4217-8811
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| CReDIT Contributor Roles: |
Froebrich, Dirk.
| Creator's ORCID: |
https://orcid.org/0000-0003-4734-3345
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| CReDIT Contributor Roles: |
Dickers, Matthew D..
| Creator's ORCID: |
https://orcid.org/0000-0001-9615-9101
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| CReDIT Contributor Roles: |
Dover, Lord.
| Creator's ORCID: |
https://orcid.org/0000-0003-2082-3744
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| CReDIT Contributor Roles: |
Urquhart, James S..
| Creator's ORCID: |
https://orcid.org/0000-0002-1605-8050
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| CReDIT Contributor Roles: |
Lynch, Chris J.R..
| Creator's ORCID: |
https://orcid.org/0000-0002-2427-487X
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| CReDIT Contributor Roles: |
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