LIN 250

SUSPECTED SMC   Equatorial coordinates α =  13.539757 ± 0.014800 | 00 54 09.541560 δ =  -72.695359 ± 0.012900| -72 41 43.291671   Constellation Tucana Symbiotic IR Type D’🡕 Source: Akras, S., Guzman-Ramirez, L., Leal-Ferreira, M. L., et al., 2019, ApJS, 240, 21, 2019ApJS..240…21A Spectral Type B0 I [e] Magnitude range (V) 13.0 – 14.3refWatson, C. L., Henden, A. A., Price, A., 2006, Society for Astronomical Sciences Annual Symposium, 25, 47, 2006SASS…25…47W Outbursts No

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Identifiers

LIN 250	GSC –	TYC –	WRAY –
SIMBAD LHA 115-S 18	HIP –	SAO –	Hen –
BD –	IRAS –	GAIA DR2 4688986534938381184	ESO –
HD –	2MASS J00540955-7241431	WISE J005409.55-724143.2	AAVSO 000-BLL-502

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Position

Right ascension (°)	13.539757 ± 0.014800refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G	Parallax (mas)	–	Reddening E(B-V) (mag)	0.367 ± 0.028refSchlafly, E. F., Finkbeiner, D. P., 2011, ApJ, 737, 103, 2011ApJ…737..103S
Declination (°)	-72.695359 ± 0.012900refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G	Distance (kpc)	62.10 ± 1.90refHilditch, R. W., Howarth, I. D., Harries, T. J., 2005, MNRAS, 357, 304, 2005MNRAS.357..304H
Galactic longitude (°)	302.648558 ± 0.014800refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G	Proper motion in α (mas/yr)	0.591 ± 0.031refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G
Galactic latitude (°)	-44.431394 ± 0.012900refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G	Proper motion in δ (mas/yr)	-1.173 ± 0.025refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G

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Observations

U (mag)	12.94refBoyer, M. L., Srinivasan, S., van Loon, J. T., et al., 2011, AJ, 142, 103, 2011AJ….142..103B	X-Ray	NorefBickert, K. F., Greiner, J., Stencel, R. E., 1996, Supersoft X-ray Sources, 225, 1996LNP…472..225B	Flickering
B (mag)	13.48refMassey, P., 2002, ApJS, 141, 81, 2002ApJS..141…81M	X-Ray type		Outbursts	No
V (mag)	13.82refBonanos, A. Z., Lennon, D. J., Köhlinger, F., et al., 2010, AJ, 140, 416, 2010AJ….140..416B	IUE	Yes	Type
R (mag)	12.79refZickgraf, F. J., Wolf, B., Stahl, O., et al., 1989, A&A, 220, 206, 1989A&A…220..206Z	IRAS flux at 12 μm (Jy)		IPmax (eV)	114refTorres, A. F., Kraus, M., Cidale, L. S., et al., 2012, MNRAS, 427, L80, 2012MNRAS.427L..80T
I (mag)	12.55refBoyer, M. L., Srinivasan, S., van Loon, J. T., et al., 2011, AJ, 142, 103, 2011AJ….142..103B	IRAS flux at 25 μm (Jy)		OVI lines	YesrefTorres, A. F., Kraus, M., Cidale, L. S., et al., 2012, MNRAS, 427, L80, 2012MNRAS.427L..80T
G (mag)	13.18refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G	IRAS flux at 60 μm (Jy)
J (mag)	12.35refCutri, R. M., Skrutskie, M. F., van Dyk, S., et al., 2003, VizieR On-line Data Catalog: II/246, 2003yCat.2246….0C	IRAS flux at 100 μm (Jy)
H (mag)	11.93refCutri, R. M., Skrutskie, M. F., van Dyk, S., et al., 2003, VizieR On-line Data Catalog: II/246, 2003yCat.2246….0C	WISE W1 (mag)	9.38refCutri, R. M., et al., 2014, I II/328, 2014yCat.2328….0C
K (mag)	11.11refCutri, R. M., Skrutskie, M. F., van Dyk, S., et al., 2003, VizieR On-line Data Catalog: II/246, 2003yCat.2246….0C	WISE W2 (mag)	8.36refCutri, R. M., et al., 2014, I II/328, 2014yCat.2328….0C
L (mag)	9.45refZickgraf, F. J., Wolf, B., Stahl, O., et al., 1989, A&A, 220, 206, 1989A&A…220..206Z	WISE W3 (mag)	6.28refCutri, R. M., et al., 2014, I II/328, 2014yCat.2328….0C
		WISE W4 (mag)	4.88refCutri, R. M., et al., 2014, I II/328, 2014yCat.2328….0C
		Radio
		Radio flux (mJy)

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Orbit

Orbital period (days)		γ velocity (km/h)		Size of giant’s orbit (AU)
Eccentricity		RV of giant (km/h)		Separation (AU)
Inclination (°)		Inferior conj. of giant (JD)		Mass function
Ephemeris type				Mass ratio
Ephemeris T0 (JD)

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Cool component

Spectral type	B0 I [e]refZickgraf, F. J., Wolf, B., Stahl, O., et al., 1989, A&A, 220, 206, 1989A&A…220..206Z	Mass (M⊙)	35-40refZickgraf, F. J., Wolf, B., Stahl, O., et al., 1989, A&A, 220, 206, 1989A&A…220..206Z	Pulsation
Eff. temperature (K)	25000refZickgraf, F. J., Wolf, B., Stahl, O., et al., 1989, A&A, 220, 206, 1989A&A…220..206Z 4015refAkras, S., Guzman-Ramirez, L., Leal-Ferreira, M. L., et al., 2019, ApJS, 240, 21, 2019ApJS..240…21A	Radius (R⊙)	33-36refZickgraf, F. J., Wolf, B., Stahl, O., et al., 1989, A&A, 220, 206, 1989A&A…220..206Z	Type
IR type	D’🡕 Source: Akras, S., Guzman-Ramirez, L., Leal-Ferreira, M. L., et al., 2019, ApJS, 240, 21, 2019ApJS..240…21A, refAkras, S., Guzman-Ramirez, L., Leal-Ferreira, M. L., et al., 2019, ApJS, 240, 21, 2019ApJS..240…21A	Luminosity (L⊙)	300000-460000refZickgraf, F. J., Wolf, B., Stahl, O., et al., 1989, A&A, 220, 206, 1989A&A…220..206Z	Pulsation period (days)
Metallicity [Fe/H]				Ephemeris type
				Ephemeris T0 (JD)

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Hot component

Type/Spectra		Mass (M⊙)		Spin period (min)
Eff. temperature (K)		Radius (R⊙)		Accretion disk
Lower limit (K)		Luminosity (L⊙)
Upper limit (K)

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Links

SIMBAD     CDS Portal     VSX

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Notes

LHA 115-S 18 is a very peculiar emission-line star exhibiting the B[e] phenomenon. Its spectrum shows features of an extremely wide range of excitation and ionization stages, extending from highly ionized atomic lines (Si IV, C IV, He II) in the ultraviolet and optical regions to molecular emission bands of CO and TiO in the optical and infrared regions (Torres et al., 2012). They also observed Raman-scattered O VI lines in the spectra of the star but according to their analysis, a symbiotic B[e] scenario seems not to be the most plausible. Therefore we classified this object only as a suspected symbiotic star. On the other hand, Akras et al. (2019) list this star as confirmed one. 

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References

• Akras, S., Guzman-Ramirez, L., Leal-Ferreira, M. L., et al., 2019, ApJS, 240, 21, 2019ApJS..240…21A 
• Shore, S. N., Sanduleak, N., Allen, D. A., 1987, A&A, 176, 59, 1987A&A…176…59S
• Torres, A. F., Kraus, M., Cidale, L. S., et al., 2012, MNRAS, 427, L80, 2012MNRAS.427L..80T
• van Genderen, A. M.,  Sterken, C., 2002, A&A, 386, 926, 2002A&A…386..926V
• Zickgraf, F. J., Wolf, B., Stahl, O., et al., 1989, A&A, 220, 206, 1989A&A…220..206Z

Last updated: May 2, 2019 @ 11:02 am