J/A+A/580/A19 Hen 2-155 and Hen 2-161 photometry and spectroscopy (Jones+, 2015)
The post-common envelope central stars of the planetary nebulae Henize 2-155
and Henize 2-161.
Jones D., Boffin H.M.J., Rodriguez-Gil P., Wesson R., Corradi R.L.M.,
Miszalski B., Mohamed S.
<Astron. Astrophys. 580, A19 (2015)>
=2015A&A...580A..19J 2015A&A...580A..19J
ADC_Keywords: Binaries, eclipsing ; Planetary nebulae ; Photometry, CCD
Keywords: binaries: eclipsing - binaries: close - circumstellar matter -
planetary nebulae: individual: Henize 2-155 -
planetary nebulae: individual: Henize 2-161
Abstract:
We present a study of Hen 2-155 and Hen 2-161, two planetary nebulae
which bear striking morphological similarities to other planetary
nebulae known to host close-binary central stars. Both central stars
are revealed to be photometric variables while spectroscopic
observations confirm that Hen 2-155 is host to a double-eclipsing,
post-common-envelope system with an orbital period of 3h 33m making it
one of the shortest period binary central stars known. The
observations of Hen 2-161 are found to be consistent with a
post-common-envelope binary of period ∼1-day.
Description:
CCD photometry of the central stars of Hen 2-155 and Hen 2-161,
carried out using the EFOSC2 instrument on the 3.6-m ESO-NTT. Hen
2-155 was observed with the Hβ-continuum filter (#743) on the
nights of February 27-29, March 1-2 2012, and February 23-26 2014,
while Hen 2-161 was ob- served with the Gunn i filter (#705) on the
nights of February 29, March 1-2 2012, January 14-15, June 2-6 2013,
and February 23-26 2014.
Objects:
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RA (2000) DE Designation(s) (Per)
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16 19 23.17 -42 15 36.6 Hen 2-155 = IC 4599 (0.148275)
16 24 37.79 -53 22 34.1 Hen 2-161 = PN Sa 2-144 (1.011)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 36 119 Hβ-continuum photometry of central star of
Hen 2-155 (table 2)
table3.dat 34 181 I-band photometry of central star of Hen 2-161
(table 3)
table4.dat 32 13 Radial velocity measurements of central star of
Hen 2-155 (table 4)
table5.dat 32 13 Radial velocity measurements of the CIV line
in the central star of Hen 2-155 (table 5)
table6.dat 73 106 Observed and dereddened nebular emission line
fluxes from Hen 2-155 and Hen 2-161 (table 6)
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Byte-by-byte Description of file: table2.dat table3.dat
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Bytes Format Units Label Explanations
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1- 15 F15.7 d JD Julian Date
18- 24 F7.4 mag mag Apparent magnitude in Band
27- 32 F6.4 mag e_mag [0.009/0.06] Uncertainty of magnitude
34- 36 A3 --- Band [Hbc I] Band: Hbc=Hβ continuum, I=Gunn
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Byte-by-byte Description of file: table4.dat table5.dat
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Bytes Format Units Label Explanations
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1- 15 F15.7 d JD Julian Date
17- 24 F8.4 km/s RV [-64/60] Radial velocity
27- 32 F6.4 km/s e_RV [2/6] Uncertainty of radial velocity measurement
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 0.1nm lambda [3664/7136] Observed wavelength
9- 15 A7 --- Ion Ion
17- 22 F6.2 --- F2155 ?=- Observed nebular emission line flux
F(λ) for Hen 2-155 (1)
24- 27 F4.2 --- e_F2155 ? rms uncertainty on F2155
29- 34 F6.2 --- I2155 ?=- Dereddened nebular emission line flux
I(λ) for Hen 2-155 (1)
36- 39 F4.2 --- E_I2155 ? Error on I2155 (upper value)
41- 44 F4.2 --- e_I2155 ? Error on I2155 (lower value)
46- 51 F6.2 --- F2161 ?=- Observed nebular emission line flux
F(λ) for Hen 2-161 (1)
53- 56 F4.2 --- e_F2161 ? rms uncertainty on F2161
58- 63 F6.2 --- I2161 ?=- Dereddened nebular emission line flux
I(λ) for Hen 2-161 (1)
65- 68 F4.2 --- E_I2161 ? Error on I2161 (upper value)
70- 73 F4.2 --- e_I2161 ? Error on I2161 (lower value)
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Note (1): Normalized to F(Hβ)=100 and I(Hβ)=100.
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Acknowledgements:
David Jones, djones(at)iac.es
(End) David Jones [IAC, Spain], Patricia Vannier [CDS] 16-Jun-2015