The History Goes On: Century Long Study of Romano’s Star †
Abstract
1. Introduction
2. Stellar Vicinity of Romano’s Star
3. Photometry
4. Spectroscopy and Determination of Physical Parameters
5. Nebula
6. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Abbreviations
CMO | 2.5 m telescope of the Caucasian Mountain Observatory of the Sternberg Astronomical Institute of Moscow State University |
GTC | Gran Telescopio Canarias |
LBV | Luminous blue variable |
BSG | Blue supergiant |
RSG | Red supergiant |
SAO RAS | Special Astrophysical observatory of Russian Academy of Sciences |
WR | Wolf-Rayet |
WN | Nitrogen-rich Wolf-Rayet stars |
WC | Carbon-rich Wolf-Rayet stars |
YHG | Yellow hypergiant |
Appendix A. Spectra of Stars in Vicinity of GR 290
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1. | The object has coordinates , at J2000 epoch. |
2. | The adopted distance to M 33 is kpc (distance module ) from Galleti et al. [14]. |
3. | General observational archive of Special Astrophysical observatory is available at https://www.sao.ru/oasis/cgi-bin/fetch?lang=en. |
4. | ScoRE package available at http://www.sao.ru/hq/ssl/maryeva/score.htm. |
5. | STELIB is availabte at http://webast.ast.obs-mip.fr/stelib. |
6. | In Humphreys [33], Romano’s star is identified as B 601. |
7. | Effective temperature is defined as a temperature at radius , where the Rosseland optical depth is equal to 2/3. |
Name | Coordinates | Spectral | V | ||
---|---|---|---|---|---|
Class | [mag] | ||||
J013449.49+304127.2 | 01:34:49.46 | +30:41:27.1 | YSG: | 16.468 | 0.854 |
J013453.20+304242.8 | 01:34:53.17 | +30:42:42.7 | G/KV | 17.031 | 0.906 |
J013453.97+304043.4 | 01:34:53.94 | +30:40:43.3 | RSG: | 19.492 | 1.558 |
J013454.31+304109.8 | 01:34:54.28 | +30:41:09.7 | RSG | 18.450 | 2.045 |
J013455.06+304114.4 | 01:34:55.03 | +30:41:14.3 | B0I+Neb | 18.246 | −0.103 |
J013457.20+304146.1 | 01:34:57.17 | +30:41:46.0 | B3I | 18.872 | −0.088 |
J013458.77+304151.7 | 01:34:58.74 | +30:41:51.6 | RSG | 19.121 | 1.605 |
J013458.89+304129.0 | 01:34:58.86 | +30:41:28.9 | WC4 | 20.662 | 0.238 |
J013459.07+304154.9 | 01:34:59.04 | +30:41:54.8 | RSG | 19.030 | 1.986 |
J013459.08+304142.8 | 01:34:59.05 | +30:41:42.7 | B2I: | 19.306 | −0.163 |
J013459.29+304128.0 | 01:34:59.26 | +30:41:27.9 | B0.5:I | 18.822 | −0.112 |
J013459.39+304201.2 | 01:34:59.36 | +30:42:01.1 | O8Iaf | 18.254 | −0.142 |
J013459.81+304156.9 | 01:34:59.78 | +30:41:56.8 | RSG: | 19.156 | 1.531 |
J013500.30+304150.9 | 01:35:00.27 | +30:41:50.8 | cLBV | 19.298 | −0.073 |
J013500.32+304147.3 | 01:35:00.29 | +30:41:47.2 | B0-2I | 20.995 | −0.183 |
J013501.36+304149.6 | 01:35:01.33 | +30:41:49.5 | Late O/Early B | 19.346 | −0.279 |
J013501.71+304159.2 | 01:35:01.68 | +30:41:59.1 | B1.5Ia | 18.076 | −0.099 |
J013502.06+304034.2 | 01:35:02.03 | +30:40:34.1 | RSG | 18.500 | 1.365 |
J013502.30+304153.7 | 01:35:02.27 | +30:41:53.6 | B0.5Ia | 18.933 | −0.099 |
J013505.37+304114.9 | 01:35:05.34 | +30:41:14.8 | WC4-5 | 19.061 | −0.293 |
J013505.74+304101.9 | 01:35:05.71 | +30:41:01.8 | O6III(f)+Neb | 18.218 | −0.207 |
J013506.87+304149.8 | 01:35:06.84 | +30:41:49.7 | B0.5Ib | 18.655 | −0.181 |
J013507.43+304132.6 | 01:35:07.40 | +30:41:32.5 | RSG | 18.582 | 1.991 |
J013507.53+304208.4 | 01:35:07.50 | +30:42:08.3 | RSG | 19.961 | 1.739 |
N | Coordinates | Spectral | V | Instrument | ||
---|---|---|---|---|---|---|
Class | [mag] | |||||
1 | 01:34:59.79 | +30:41:56.9 | RSG / M0-M1 | 19.156 | 1.531 | OSIRIS |
2 | 01:35:00.69 | +30:42:07.5 | RSG / K3-K4 | 20.507 | 1.613 | OSIRIS |
3 | 01:35:00.90 | +30:40:18.2 | RSG / K5-M0 | SCORPIO | ||
4 | 01:35:01.87 | +30:41:57.3 | B5-B7 | 19.980 | −0.079 | OSIRIS |
5 | 01:35:02.37 | +30:43:32.1 | F: | 21.773 | 0.059 | OSIRIS |
6 | 01:35:03.29 | +30:40:42.5 | RSG / K-M | 20.339 | 1.088 | SCORPIO |
7 | 01:35:04.37 | +30:42:53.1 | G4-K1 | 16.459 | 0.733 | SCORPIO |
8 | 01:35:05.76 | +30:41:02.2 | star with em.lines | SCORPIO | ||
9 | 01:35:05.87 | +30:41:14.2 | star with em.lines | 18.522 | −0.082 | SCORPIO |
10 | 01:35:06.14 | +30:41:29.0 | F4-F6 V | 17.365 | 0.561 | SCORPIO |
11 | 01:35:07.09 | +30:42:12.4 | F4-F7 V | 14.888 | 0.592 | SCORPIO |
12 | 01:35:07.15 | +30:41:56.3 | G8-K1 | 17.793 | 0.962 | OSIRIS |
13 e | 01:35:07.40 | +30:41:32.5 | RSG / M0-M1 | 18.582 | 1.991 | SCORPIO |
14 | 01:35:09.63 | +30:41:46.1 | A9-F0 | 20.817 | 0.246 | OSIRIS SCORPIO |
15 | 01:35:11.40 | +30:42:50.8 | F4-G2 V | 20.164 | 0.647 | SCORPIO |
16 | 01:35:11.66 | +30:44:08.3 | hot star | 20.490 | 0.161 | SCORPIO |
17 | 01:35:12.05 | +30:43:27.2 | cool star | 20.149 | 1.220 | SCORPIO |
01:35:14.10 | +30:44:23.3 | hot star with abs.lines | 17.654 | −0.038 | SCORPIO |
Date | B | V | R | I | Obs | ||||
---|---|---|---|---|---|---|---|---|---|
31 July 2016 | 18.75 | 0.03 | 18.77 | 0.04 | 18.59 | 0.04 | 18.66 | 0.05 | Loiano |
4 August 2016 | 18.75 | 0.03 | 18.77 | 0.04 | 18.59 | 0.04 | 18.66 | 0.05 | Loiano |
29 October 2016 | 18.60 | 0.1 | ARA | ||||||
30 October 2016 | 18.80 | Loiano | |||||||
31 October 2016 | 18.68 | 0.15 | ARA | ||||||
28 December 2016 | 18.78 | 0.15 | 18.71 | 0.15 | ARA | ||||
16 February 2017 | 18.70 | 0.04 | 18.68 | 0.04 | 18.59 | 0.05 | 18.73 | 0.06 | Loiano |
28 July 2017 | 18.80 | 0.04 | 18.62 | 0.05 | Loiano | ||||
30 July 2017 | 18.87 | 0.12 | ARA | ||||||
17 December 2017 | 18.67 | 0.10 | ARA | ||||||
14 February 2018 | 18.69 | 0.05 | 18.77 | 0.06 | 18.64 | 0.08 | RTT-150 | ||
19 August 2018 | 18.81 | 0.10 | ARA | ||||||
4 September 2018 | 18.53 | 0.04 | 18.67 | 0.04 | 18.54 | 0.04 | 19.48 | 0.04 | CMO |
11 September 2018 | 18.84 | 0.04 | 18.64 | 0.04 | Loiano | ||||
13 September 2018 | 18.65 | 0.04 | 18.73 | 0.04 | 18.63 | 0.04 | 19.51 | 0.04 | CMO |
19 September 2018 | 18.74 | 0.05 | 18.83 | 0.04 | 18.70 | 0.04 | Loiano | ||
10 January 2019 | 18.84 | 0.06 | 18.74 | 0.05 | Loiano |
GALEX | 2MASS | Spitzer | ||||
---|---|---|---|---|---|---|
Far-UV 1516 Å | Near-UV 2267 Å | J | H | K | 3.6 m | 4.5 m |
16.657 | 16.335 | 15.921 | ||||
[30] | [31] | [32] |
Date | V | Sp. | T | log T | log | f | H/He | Ref. | ||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
[mag] | type | [kK] | [] | [] | [] | [] | [] | |||||
Oct. 2002 | 17.98 | WN10h | 28.1 | 4.45 | 31.6 | 5.6 | 5.75 | 1.9 | 0.15 | 1.7 | [10] | |
Feb. 2003 | 17.70 | WN10.5h | 28.0 | 4.45 | 37 | 7.5 | 5.875 | 2.2 | 0.15 | 1.7 | [10] | |
Jan. 2005 | 17.24 | WN11h | 23.6 | 4.37 | 54 | 8.2 | 5.91 | 3.5 | 0.15 | 1.7 | [10] | |
Sep. 2006 | 18.4 | WN8h | 30.7 | 4.49 | 24 | 4.6 | 5.66 | 1.3 | 0.15 | 1.7 | [10] | |
Oct. 2007 | 18.6 | WN8h | 33.5 | 4.53 | 20 | 4.5 | 5.65 | 1.55 | 0.15 | 1.7 | [10] | |
Dec. 2008 | 18.31 | WN8h | 31.6 | 4.50 | 23.5 | 5.0 | 5.7 | 1.9 | 0.15 | 1.7 | [10] | |
Oct. 2009 | 18.36 | WN9h | 31.6 | 4.50 | 23.8 | 5.1 | 5.7 | 1.7 | 0.15 | 1.7 | [10] | |
Sep. 2010 | 17.8 | WN10h | 26 | 4.41 | 41.5 | 5.85 | 2.18 | 0.25 | 265 | 1.5 | [47] | |
Dec. 2010 | 17.95 | WN10h | 26.9 | 4.43 | 33 | 5.3 | 5.72 | 2.05 | 0.15 | 1.7 | [10] | |
Aug. 2014 | 18.74 | WN8h | 32.8 | 4.52 | 19 | 3.7 | 5.57 | 1.4 | 0.15 | 1.7 | [10] | |
Jul. 2016 | 18.77 | WN8h | 30.0 | 4.48 | 21 | 3.7 | 5.57 | 1.5 | 0.15 | 2.2 | [22] | |
Sep. 2018 | 18.77 | WN8h | 30.0 | 4.48 | 21 | 3.7 | 5.57 | 1.5 | 0.15 | 2.2 |
Star | Sp.type | Ref. | Comments |
---|---|---|---|
Wray 15-751 | O9.5 I | [61] | LBVc, Milky Way |
Sk | O9.2 Iaf | [62] | ex-/dormant LBV [63], BSG evolved off the Main Sequence [62] |
Hen 3-519 | WN11 | [64] | ex-/dormant LBV [63], there are no significant changes of brightness [65] |
AG Car | WN11 | [40] | LBV, Milky Way |
WS 1 | WN11 | [41,42] | LBV, Milky Way |
R 127 | Ofpe/WN9 | [43] | LBV, Large Magellanic Cloud |
HD 269582 | Ofpe/WN9 | [44] | LBV, Large Magellanic Cloud |
GR 290 | WN8 | [10,22] | post-LBV, M33 |
HD 5980 | LBV+WN4+OI | [66,67] | LBV, Small Magellanic Cloud |
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Maryeva, O.; Viotti, R.F.; Koenigsberger, G.; Calabresi, M.; Rossi, C.; Gualandi, R. The History Goes On: Century Long Study of Romano’s Star. Galaxies 2019, 7, 79. https://doi.org/10.3390/galaxies7030079
Maryeva O, Viotti RF, Koenigsberger G, Calabresi M, Rossi C, Gualandi R. The History Goes On: Century Long Study of Romano’s Star. Galaxies. 2019; 7(3):79. https://doi.org/10.3390/galaxies7030079
Chicago/Turabian StyleMaryeva, Olga, Roberto F. Viotti, Gloria Koenigsberger, Massimo Calabresi, Corinne Rossi, and Roberto Gualandi. 2019. "The History Goes On: Century Long Study of Romano’s Star" Galaxies 7, no. 3: 79. https://doi.org/10.3390/galaxies7030079
APA StyleMaryeva, O., Viotti, R. F., Koenigsberger, G., Calabresi, M., Rossi, C., & Gualandi, R. (2019). The History Goes On: Century Long Study of Romano’s Star. Galaxies, 7(3), 79. https://doi.org/10.3390/galaxies7030079