Draco C-1

CONFIRMED Draco Dwarf   Equatorial coordinates α =  259.990238 ± 0.045145 | 17 19 57.657086 δ =  +57.834856 ± 0.046994 | +57 50 05.482634   Constellation Draco Symbiotic IR Type S🡕 Source: Akras, S., Guzman-Ramirez, L., Leal-Ferreira, M. L., et al., 2019, ApJS, 240, 21, 2019ApJS..240…21A Spectral Type C1.2 Magnitude range (V) 17.0-17.4refMunari, U., Siviero, A., Ochner, P., et al., 2008, Information Bulletin on Variable Stars, 5855, 2008IBVS.5855….1M Outbursts No

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Identifiers

Draco C-1	GSC –	TYC –	WRAY –
SIMBAD [ALS82] C1	HIP –	SAO –	Hen –
BD –	IRAS –	GAIA DR2 1433154243632773248	ESO –
HD –	2MASS J17195764+5750054	WISE  J171957.65+575005.5	AAVSO 000-BJT-701

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Position

Right ascension (°)	259.990238 ± 0.045145refGaia 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)	0.023 ± 0.002refSchlafly, E. F., Finkbeiner, D. P., 2011, ApJ, 737, 103, 2011ApJ…737..103S
Declination (°)	+57.834856 ± 0.046994refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G	Distance (kpc)	80 ± 10refKarachentsev, I. D., Karachentseva, V. E., Huchtmeier, W. K., et al., 2004, AJ, 127, 2031, 2004AJ….127.2031K
Galactic longitude (°)	86.272566 ± 0.046994refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G	Proper motion in α (mas/yr)	–
Galactic latitude (°)	+34.759213  ± 0.045145refGaia Collaboration, Brown, A. G. A., Vallenari, A., et al., 2018, A&A, 616, A1, 2018A&A…616A…1G	Proper motion in δ (mas/yr)	–

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Observations

U (mag)		X-Ray	YesrefMuerset, U., Wolff, B., Jordan, S., 1997, A&A, 319, 201, 1997A&A…319..201M	Flickering
B (mag)	18.43refAaronson, M., Liebert, J., Stocke, J., 1982, ApJ, 254, 507, 1982ApJ…254..507A	X-Ray type	αrefMuerset, U., Wolff, B., Jordan, S., 1997, A&A, 319, 201, 1997A&A…319..201M	Outbursts	No
V (mag)	17.00refAaronson, M., Liebert, J., Stocke, J., 1982, ApJ, 254, 507, 1982ApJ…254..507A	IUE	Yes	Type
R (mag)	16.11refAaronson, M., Liebert, J., Stocke, J., 1982, ApJ, 254, 507, 1982ApJ…254..507A	IRAS flux at 12 μm (Jy)		IPmax (eV)	77.5
I (mag)	15.67refAaronson, M., Liebert, J., Stocke, J., 1982, ApJ, 254, 507, 1982ApJ…254..507A	IRAS flux at 25 μm (Jy)		OVI lines	NorefMunari, U., 1991, A&A, 251, 103, 1991A&A…251..103M
G (mag)	16.63refGaia 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)	14.38refCutri, 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)	13.71refCutri, R. M., Skrutskie, M. F., van Dyk, S., et al., 2003, VizieR On-line Data Catalog: II/246, 2003yCat.2246….0C	WISE W1 (mag)	13.25refCutri, R. M., et al., 2014, I II/328, 2014yCat.2328….0C
K (mag)	13.46refCutri, R. M., Skrutskie, M. F., van Dyk, S., et al., 2003, VizieR On-line Data Catalog: II/246, 2003yCat.2246….0C	WISE W2 (mag)	13.26refCutri, R. M., et al., 2014, I II/328, 2014yCat.2328….0C
L (mag)		WISE W3 (mag)	12.69refCutri, R. M., et al., 2014, I II/328, 2014yCat.2328….0C
		WISE W4 (mag)	9.68refCutri, R. M., et al., 2014, I II/328, 2014yCat.2328….0C
		Radio	3.6 cmrefSeaquist, E. R., Krogulec, M., Taylor, A. R., 1993, ApJ, 410, 260, 1993ApJ…410..260S
		Radio flux (mJy)	<0.1refSeaquist, E. R., Krogulec, M., Taylor, A. R., 1993, ApJ, 410, 260, 1993ApJ…410..260S

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Orbit

Orbital period (days)	1220 (+3.7, -3.5)refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962	γ velocity (km/h)	-298.991 (+0.025, -0.026)refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962	Size of giant’s orbit (AU)
Eccentricity	0.1906 (+0.0076, -0.0078)refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962	RV of giant (km/h)	5.2244 (+0.045, -0.041)refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962	Separation (AU)	2.227 (+0.071, -0.069)refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962
Inclination (°)		Inferior conj. of giant (JD)		Mass function
Ephemeris type				Mass ratio	0.344refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962
Ephemeris T0 (JD)

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Cool component

Spectral type	C1.2refAaronson, M., Liebert, J., Stocke, J., 1982, ApJ, 254, 507, 1982ApJ…254..507A	Mass (M⊙)	0.735 (+0.093, -0.091)refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962	Pulsation
Eff. temperature (K)	3934 (+75, -71)refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962	Radius (R⊙)	101.6 (+4.7, -5.4)refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962	Type
IR type	S🡕 Source: Akras, S., Guzman-Ramirez, L., Leal-Ferreira, M. L., et al., 2019, ApJS, 240, 21, 2019ApJS..240…21A, refPhillips, J. P., 2007, MNRAS, 376, 1120, 2007MNRAS.376.1120	Luminosity (L⊙)	2130 (+160, -400)refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962	Pulsation period (days)
Metallicity [Fe/H]	-1.34 (+0.18, -0.20)refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962			Ephemeris type
				Ephemeris T0 (JD)

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Hot component

Type/Spectra	WDrefMunari, U., Buson, L. M., 1994, A&A, 287, 87, 1994A&A…287…87M	Mass (M⊙)	0.56 ± 0.6refSaeedi, S., Sasaki, M., Ducci, L., 2018, MNRAS, 473, 440, 2018MNRAS.473..440S >0.253 (+0.012, -0.011)refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962	Spin period (min)
Eff. temperature (K)	180000 ± 30000refSaeedi, S., Sasaki, M., Ducci, L., 2018, MNRAS, 473, 440, 2018MNRAS.473..440S	Radius (R⊙)	0.21-0.30refMunari, U., 1991, A&A, 251, 103, 1991A&A…251..103M 0.17 ± 0.06refLewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962	Accretion disk
Lower limit (K)		Luminosity (L⊙)	7500-31000refMunari, U., Buson, L. M., 1994, A&A, 287, 87, 1994A&A…287…87M
Upper limit (K)

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Links

SIMBAD     CDS Portal     VSX

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Notes

Draco C-1 was discovered by Aarson et al. (1992) in search of carbon stars. They noted that the Zantra temperature of the photoionization source is extremely high. According to Munari (1991), observed spectral characteristics match well with the case of a white dwarf accreting at low rates from the carbon star companion. The spectrum shows many emission lines. Analysis of X-ray, ultraviolet (UV), and optical data taken with XMM-Newton was presented in Saeedi et al. (2018). Lewis et al. (2020) presented the precise orbital parameters based on the high-resolution spectroscopic observations.

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References

• Aaronson, M., Liebert, J., Stocke, J., 1982, ApJ, 254, 507, 1982ApJ…254..507A
• Akras, S., Guzman-Ramirez, L., Leal-Ferreira, M. L., et al., 2019, ApJS, 240, 21, 2019ApJS..240…21A
• Lewis, H. M., Anguiano, B., Stassun, K. G., et al., 2020, arXiv:2008.05962
• Muerset, U., Wolff, B., Jordan, S., 1997, A&A, 319, 201, 1997A&A…319..201M
• Munari, U., 1991, A&A, 251, 103, 1991A&A…251..103M
• Munari, U., Buson, L. M., 1994, A&A, 287, 87, 1994A&A…287…87M
• Munari, U., Siviero, A., Ochner, P., et al., 2008, Information Bulletin on Variable Stars, 5855, 2008IBVS.5855….1M
• Saeedi, S., Sasaki, M., Ducci, L., 2018, MNRAS, 473, 440, 2018MNRAS.473..440S

Last updated: Sep 19, 2020 @ 10:22 am