A survey for variable stars with small telescopes: IX -- Evolution of Spot Properties on YSOs in IC5070
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2024
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| author | Herbert, Carys Froebrich, Dirk Vanaverbeke, Siegfried Scholz, Aleks Eislöffel, Jochen Urtly, Thomas Walton, Ivan L. Wiersema, Klaas Quinn, Nick J. Piehler, Georg Aimar, Mario Morales García, Rafael Castillo Vanmunster, Tonny Alfaro, Francisco C. Soldán de la Cuesta, Faustino García Licchelli, Domenico Perez, Alex Escartin Mañanes, Esteban Fernández Ribes, Noelia Graciá González, José Luis Salto Futcher, Stephen R. L. Nelson, Tim Dvorak, Shawn Moździerski, Dawid Kotysz, Krzysztof Mikołajczyk, Przemysław Fleming, George Phillips, Mark Vale, Tony Dubois, Franky Eggenstein, Heinz-Bernd Heald, Michael A. Lewin, Pablo OKeeffe, Derek Popowicz, Adam Bernacki, Krzysztof Malcher, Andrzej Lasota, Slawomir Fiolka, Jerzy Dustor, Adam Percy, Stephen C. Devine, Pat Patel, Aashini L. Dickers, Matthew D. Dover, Lord Grozdanova, Ivana I. Urquhart, James S. Lynch, Chris J. R. |
| author_facet | Herbert, Carys Froebrich, Dirk Vanaverbeke, Siegfried Scholz, Aleks Eislöffel, Jochen Urtly, Thomas Walton, Ivan L. Wiersema, Klaas Quinn, Nick J. Piehler, Georg Aimar, Mario Morales García, Rafael Castillo Vanmunster, Tonny Alfaro, Francisco C. Soldán de la Cuesta, Faustino García Licchelli, Domenico Perez, Alex Escartin Mañanes, Esteban Fernández Ribes, Noelia Graciá González, José Luis Salto Futcher, Stephen R. L. Nelson, Tim Dvorak, Shawn Moździerski, Dawid Kotysz, Krzysztof Mikołajczyk, Przemysław Fleming, George Phillips, Mark Vale, Tony Dubois, Franky Eggenstein, Heinz-Bernd Heald, Michael A. Lewin, Pablo OKeeffe, Derek Popowicz, Adam Bernacki, Krzysztof Malcher, Andrzej Lasota, Slawomir Fiolka, Jerzy Dustor, Adam Percy, Stephen C. Devine, Pat Patel, Aashini L. Dickers, Matthew D. Dover, Lord Grozdanova, Ivana I. Urquhart, James S. Lynch, Chris J. R. |
| contents | We present spot properties on 32 periodic young stellar objects in IC 5070. Long term, $\sim$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 $\sim$2000 K. Cold and warm spots have maximum surface coverage values of 40 percent, although only 16 percent of warm spots are above 20 percent surface coverage as opposed to 60 percent 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_10595 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A survey for variable stars with small telescopes: IX -- Evolution of Spot Properties on YSOs in IC5070 Herbert, Carys Froebrich, Dirk Vanaverbeke, Siegfried Scholz, Aleks Eislöffel, Jochen Urtly, Thomas Walton, Ivan L. Wiersema, Klaas Quinn, Nick J. Piehler, Georg Aimar, Mario Morales García, Rafael Castillo Vanmunster, Tonny Alfaro, Francisco C. Soldán de la Cuesta, Faustino García Licchelli, Domenico Perez, Alex Escartin Mañanes, Esteban Fernández Ribes, Noelia Graciá González, José Luis Salto Futcher, Stephen R. L. Nelson, Tim Dvorak, Shawn Moździerski, Dawid Kotysz, Krzysztof Mikołajczyk, Przemysław Fleming, George Phillips, Mark Vale, Tony Dubois, Franky Eggenstein, Heinz-Bernd Heald, Michael A. Lewin, Pablo OKeeffe, Derek Popowicz, Adam Bernacki, Krzysztof Malcher, Andrzej Lasota, Slawomir Fiolka, Jerzy Dustor, Adam Percy, Stephen C. Devine, Pat Patel, Aashini L. Dickers, Matthew D. Dover, Lord Grozdanova, Ivana I. Urquhart, James S. Lynch, Chris J. R. Solar and Stellar Astrophysics Astrophysics of Galaxies We present spot properties on 32 periodic young stellar objects in IC 5070. Long term, $\sim$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 $\sim$2000 K. Cold and warm spots have maximum surface coverage values of 40 percent, although only 16 percent of warm spots are above 20 percent surface coverage as opposed to 60 percent 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. |
| title | A survey for variable stars with small telescopes: IX -- Evolution of Spot Properties on YSOs in IC5070 |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2403.10595 |