Y Lyncis

Variable star in the constellation Lynx

Y Lyncis
Observation data Epoch J2000 Equinox J2000
A visual band light curve for Y Lyncis, adapted from Percy et al. (2001).^[1] The top panel shows the brightness variation over a period of several years, and the lower panel shows shorter time scale variations.
Constellation	Lynx
Right ascension	07^h 28^m 11.61657^s^[2]
Declination	+45° 59′ 26.2295″^[2]
Apparent magnitude (V)	6.2 - 8.9^[3]
Characteristics
Spectral type	M6S Ib^[4]
Variable type	SRc^[4]
Astrometry

Radial velocity (R_v)	5.50±0.6^[5] km/s
Proper motion (μ)	RA: −1.278^[2] mas/yr Dec.: −4.067^[2] mas/yr
Parallax (π)	2.8068 ± 0.1138 mas^[2]
Distance	1,160 ± 50 ly (360 ± 10 pc)

Details

Mass	1.5 - 2.0^[3] `M`_☉
Radius	580^[3] `R`_☉
Luminosity	10,765^[6] `L`_☉
Surface gravity (log g)	0.0^[7] cgs
Temperature	3,200^[7] K
Metallicity [Fe/H]	−0.19^[7] dex

Other designations
Y Lyn, HD 58521, BD+46°1271, HIP 36288, SAO 41784
Database references
SIMBAD	data

Y Lyncis is a semiregular variable star in the constellation Lynx. It is an asymptotic giant branch star of spectral type M6S, with a luminosity class of Ib, indicating a supergiant luminosity. It is around 1,160 light years away.

Y Lyncis ranges in brightness from magnitude 6.2 to 8.9. Its changes in brightness are complex with at least two different periods showing. The General Catalogue of Variable Stars lists a period of 110 days.^[8] More recent studies show a primary pulsation period of 133 days, with and a long secondary period with an amplitude of 0.2 magnitudes and duration 1,300 days. The long secondary period variations are possibly caused by long-lived convection cells.^[9]

Y Lyncis has a mass around 1.5-2.0 M_☉ and a luminosity around 10,000 L_☉. It is a thermally pulsing asymptotic giant branch star, an evolved star with a carbon-oxygen core that is fusing helium in a shell and hydrogen in a separate shell.^[10] It is also an S-type star, where third dredge-ups have brought some carbon to the surface, but not enough to create a carbon star.^[6]

References

^ Percy, John R.; Wilson, Joseph B..; Henry, Gregory W. (August 2001). "Long-Term VRI Photometry of Small-Amplitude Red Variables. I. Light Curves and Periods". Publications of the Astronomical Society of the Pacific. 113 (786): 983–996. Bibcode:2001PASP..113..983P. doi:10.1086/322153. S2CID 14609175.
^ ^a ^b ^c ^d ^e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b ^c Szatmary, Karoly; Vinko, Jozsef (1992). "Periodicities of the light curve of the semiregular variable star Y Lyncis". Monthly Notices of the Royal Astronomical Society. 256 (2): 321–28. Bibcode:1992MNRAS.256..321S. doi:10.1093/mnras/256.2.321.
^ ^a ^b Kiss, L. L.; Szabó, Gy. M.; Bedding, T. R. (2006). "Variability in red supergiant stars: Pulsations, long secondary periods and convection noise". Monthly Notices of the Royal Astronomical Society. 372 (4): 1721–1734. arXiv:astro-ph/0608438. Bibcode:2006MNRAS.372.1721K. doi:10.1111/j.1365-2966.2006.10973.x. S2CID 5203133.
^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
^ ^a ^b Guandalini, R.; Busso, M. (2008). "Infrared photometry and evolution of mass-losing AGB stars. II. Luminosity and colors of MS and S stars". Astronomy and Astrophysics. 488 (2): 675–684. arXiv:0806.4591. Bibcode:2008A&A...488..675G. doi:10.1051/0004-6361:200809932. S2CID 14294870.
^ ^a ^b ^c Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv:1605.07384. Bibcode:2016A&A...591A.118S. doi:10.1051/0004-6361/201628497. S2CID 119258214.
^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
^ Percy, John R.; Sato, Hiromitsu (2009). "Long Secondary Periods in Pulsating Red Supergiant Stars". Journal of the Royal Astronomical Society of Canada. 103 (1): 11. Bibcode:2009JRASC.103...11P.
^ Guandalini, R.; Busso, M. (2008). "Infrared photometry and evolution of mass-losing AGB stars". Astronomy and Astrophysics. 488 (2): 675–684. arXiv:0806.4591. Bibcode:2008A&A...488..675G. doi:10.1051/0004-6361:200809932. S2CID 14294870.

Constellation of Lynx

Stars

Bayer	α ψ¹⁰ Aur (16)
Flamsteed	1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 (Alsciaukat) 32 33 34 35 36 38 42 43 44 Cam 45 Cam 46 Cam 48 Cam 50 Cam 52 Cam 54 Cam 5 LMi 10 UMa 19 UMa
Variable	R T U Y RR SW SZ TT TV TZ UU UV UX UY AN BE BF BH BK CC CY DD DI DU
HR	2463 2486 2561 2642 2645 2721 2737 2751 2776 2804 2844 2894 2903 2914 2915 2935 2939 3028 3039 3094 3106 3130 3175 3181 3200 3246 3258 3277 3287 3292 3309 3348 3351 3360 3509 3511 3545 3546 3580 3586 3612 3625 3686 3701 3809
HD	44061 52859 58681 59721 59826 63588 63630 65392 67539 75898 (Stribor)
Other	GD 98 Gliese 277 GJ 1105 GJ 3421 HS 0702+6043 IRC +60169 J0815+4729 PG 0859+415 WASP-13 (Gloas) XO-2 XO-4 (Koit) XO-5 (Absolutno)

Exoplanets	6 Lyncis b WASP-13b (Cruinlagh) XO-2Nb XO-4b (Hämarik) XO-5b (Makropulos)

Star clusters	NGC 2666

Nebulae	Jones-Emberson 1 Lynx Arc

Galaxies

NGC	2273 2273B 2308 2315 2320 2321 2322 2326 2326A 2329 2330 2332 2337 2340 2344 2415 2424 2426 2429 2429A 2429B 2431 2444 2445 2446 2456 2457 2458 2461 2462 2463 2468 2469 2472 2473 2474 2475 2476 2484 2488 2493 2495 2497 2500 2505 2518 2519 2521 2524 2528 2532 2534 2537 2537A 2541 2543 2549 2552 2638 2649 2668 2683 2691 2704 2712 2719 2719A 2724 2746 2755 2759 2770 2776 2778 2779 2780 2782 2785 2793 2798 2799 2823 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2838 2839 2840 2844 2852 2853 2860
Other	3C 171 APM 08279+5255 IC 2233 UGC 4653 UGC 4881 UGC 4904

NGC