Bol D30

SUSPECTED M31   Equatorial coordinates α =  10.422818 ± 0.231300| 00 41 41.476227 δ =  41.052261 ± 0.225000 | +41 03 08.137931   Constellation Andromeda Symbiotic IR Type   Spectral Type FI Magnitude range (V)   Outbursts No

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Identifiers

Bol D30	GSC –	TYC –	WRAY –
SIMBAD Bol D30	HIP –	SAO –	Hen –
BD –	IRAS –	GAIA DR2 381164917157806208	ESO –
HD –	2MASS –	WISE –	AAVSO –

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Position

Right ascension (°)	10.422818 ± 0.231300refGaia 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)	0.225 ± 0.025refSchlafly, E. F., Finkbeiner, D. P., 2011, ApJ, 737, 103, 2011ApJ…737..103S
Declination (°)	41.052261 ± 0.225000refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G	Distance (kpc)	785.00 ± 25.00refMcConnachie, A. W., Irwin, M. J., Ferguson, A. M. N., et al., 2005, MNRAS, 356, 979, 2005MNRAS.356..979M
Galactic longitude (°)	120.953328 ± 0.225000refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G	Proper motion in α (mas/yr)	-0.681 ± 0.499refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G
Galactic latitude (°)	-21.782042 ± 0.231300refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G	Proper motion in δ (mas/yr)	-1.322 ± 0.502refGaia 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)	19.43refCaldwell, N., Morrison, H., Kenyon, S. J., et al., 2010, AJ, 139, 372, 2010AJ….139..372C	X-Ray		Flickering
B (mag)	19.35refCaldwell, N., Morrison, H., Kenyon, S. J., et al., 2010, AJ, 139, 372, 2010AJ….139..372C	X-Ray type		Outbursts	No
V (mag)	19.02refCaldwell, N., Morrison, H., Kenyon, S. J., et al., 2010, AJ, 139, 372, 2010AJ….139..372C	IUE	No	Type
R (mag)	18.80refCaldwell, N., Morrison, H., Kenyon, S. J., et al., 2010, AJ, 139, 372, 2010AJ….139..372C	IRAS flux at 12 μm (Jy)		IPmax (eV)
I (mag)	18.53refCaldwell, N., Morrison, H., Kenyon, S. J., et al., 2010, AJ, 139, 372, 2010AJ….139..372C	IRAS flux at 25 μm (Jy)		OVI lines
G (mag)	18.93refGaia 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)		IRAS flux at 100 μm (Jy)
H (mag)		WISE W1 (mag)	14.46refCutri, R. M., et al., 2014, I II/328, 2014yCat.2328….0C
K (mag)	16.02refPeacock, M. B., Maccarone, T. J., Knigge, C., et al., 2010, MNRAS, 402, 803, 2010MNRAS.402..803P	WISE W2 (mag)	13.16refCutri, R. M., et al., 2014, I II/328, 2014yCat.2328….0C
L (mag)		WISE W3 (mag)	10.15refCutri, R. M., et al., 2014, I II/328, 2014yCat.2328….0C
		WISE W4 (mag)	7.44refCutri, 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)	-780 ± 20refCaldwell, N., Morrison, H., Kenyon, S. J., et al., 2010, AJ, 139, 372, 2010AJ….139..372C	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	FIrefCaldwell, N., Morrison, H., Kenyon, S. J., et al., 2010, AJ, 139, 372, 2010AJ….139..372C	Mass (M⊙)		Pulsation
Eff. temperature (K)	6500refCaldwell, N., Morrison, H., Kenyon, S. J., et al., 2010, AJ, 139, 372, 2010AJ….139..372C	Radius (R⊙)		Type
IR type		Luminosity (L⊙)	15000refCaldwell, N., Morrison, H., Kenyon, S. J., et al., 2010, AJ, 139, 372, 2010AJ….139..372C	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

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Notes

The star has an extremely negative velocity and is probably located in the Giant Stream in M31. Caldwell et al. (2010) speculated that the object could be a symbiotic nova.

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References

• Caldwell, N., Morrison, H., Kenyon, S. J., et al., 2010, AJ, 139, 372, 2010AJ….139..372C

Last updated: May 11, 2019 @ 2:41 pm