Table 1
Overview of the observations of the dust shell of W Hya using different telescopes.
| Instrument | Date | Φ | Ref. | λ [μm] | FOV [“×”] | Identifier |
| ISO SWS 1 | 14-02-1996 | 0.12 | Sloan et al. (2003) | 2.36–45.39 | 14 × 20 to 17 × 40 | 08902004 |
| ISO SWS 2 | 07-01-1997 | 0.17 | Justtanont et al. (2004) | 2.36–45.39 | 14 × 20 to 17 × 40 | 41800303 |
| ISO LWS 1 | 07-02-1996 | 0.1 | ISO data archivea | 43.05–195.5 | 80 × 80 to 70 × 70 | 08200208 |
| ISO LWS 2 | 05-02-1997 | 0.1 | ISO data archivea | 43.05–195.5 | 80 × 80 to 70 × 70 | 44700672 |
| ISO LWS 3 | 02-08-1997 | 0.6 | ISO data archivea | 43.05–195.5 | 80 × 80 to 70 × 70 | 62500572 |
| PACS Spec B2A | 09-07-2011 | 0.8 | Khouri et al. (2014a) | 55–73 | 30 × 30 | 1342212604 |
| PACS Spec R1A | 09-07-2011 | 0.8 | Khouri et al. (2014a) | 102–146 | 30 × 30 | 1342212604 |
| PACS Spec B2B | 14-01-2011 | 0.4 | Khouri et al. (2014a) | 70–105 | 30 × 30 | 1342223808 |
| PACS Spec R1B | 14-01-2011 | 0.4 | Khouri et al. (2014a) | 140–210 | 30 × 30 | 1342223808 |
| SPIRE Spec | 09-01-2010 | 0.27 | Khouri et al. (2014a) | 124–671 | 37 × 37 to 18 × 18 | 1342189116 |
| PACS Image 70 | 08-02-2011 | 0.47 | Cox et al. (2012) | 60–85 | 1440 × 1440 | 1342213848 |
| PACS Image 160 | 08-02-2011 | 0.47 | Cox et al. (2012) | 130–210 | 1440 × 1440 | 1342213849 |
| SCUBA | 450 and 850 | |||||
| VLT - MIDI | 04-2007 – 09-2009 | – | Zhao-Geisler et al. (2011) | 8–13 | ||
| VLT - NACO | 03-2009 and 06-2010 | 0.2b | Norris et al. (2012) | 1.04, 1.24 and 2.06 | ||
Notes. The phase Φ of the pulsation period is given based on observations of visible light made available by the AAVSO (American Association of Variable Star Observers) at http://www.aavso.org/;
Visual phase given by Norris et al. (2012).
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